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Intergraph Mylex RAID EzAssist User Reference Manual

Summary of Mylex RAID EzAssist

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    Raid ezassist™ v1.00 configuration utility user reference guide p/n: 775029-00

  • Page 3: Raid Ezassist™

    Raid ezassist™ v1.00 configuration utility user reference guide part number 775029-00 © copyright 1999 mylex corporation. All rights reserved. All contents of this manual are copyrighted by mylex corporation. The information contained herein is the exclusive property of mylex corporation and shall n...

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    Greetings this manual describes the raid ezassist v1.00 configuration utility. Requests for technical information about this and other mylex corporation products should be made to your mylex authorized reseller or mylex marketing representative. Please notice mylex is a registered trademark of mylex...

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    About this manual this installation guide covers the use of the raid ezassist v1.00 configuration utility. With raid ezassist, you can: • configure controllers and disk arrays, and define logical drives • monitor and maintain your controllers and arrays • perform advanced tasks, such as flashing new...

  • Page 7: Contents

    Manual no. 775029 vii contents chapter 1 first-time configuration welcome! .......................................................................................... 1-1 how do i configure a mylex controller for the first time? ............... 1-2 how do i configure multiple mylex controllers? ........

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    Viii raid ezassist user’s manual how do i rebuild redundancy data onto a logical drive? ........... 4-29 how do i cancel a background task that’s running on a logical drive? ......................................................... 4-34 how do i view physical drive status and information? .............

  • Page 9: Chapter 1

    Manual no. 775029 1-1 chapter 1 first-time configuration welcome! Welcome to raid ezassist™, mylex corporation’s user friendly configuration and maintenance utility for raid controllers. This chapter will help you get started step by step doing your first mylex raid controller configuration. Before ...

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    How do i configure a mylex controller for the first time? 1-2 raid ezassist user’s manual how do i configure a mylex controller for the first time? ❑ power on your system. Regardless of whether an operating system is installed on your computer system, you can run raid ezassist from the mylex control...

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    First-time configuration manual no. 775029 1-3 ❑ get started. Raid ezassist always starts by scanning for mylex controllers and target drives (figure 1-1). Figure 1-1. Raid ezassist scans for controllers and drives ☞ allow scanning to complete. Since this is a first-time configuration, you’ll see a ...

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    How do i configure a mylex controller for the first time? 1-4 raid ezassist user’s manual “would you like to configure a raid drive now?” the answer depends on whether you want to change any of the default parameters and settings for this mylex raid controller. If you are a new or inexperienced user...

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    First-time configuration manual no. 775029 1-5 table 1-1. Selecting a configuration method configuration method who should use it what it does automatic -novice users with little or no raid experience. -users who wish to set up a single array with one logical drive when all available disk drives are...

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    How do i configure a mylex controller for the first time? 1-6 raid ezassist user’s manual you choose your configuration method from the configure raid drive screen (figure 1-3). Figure 1-3. Choose a configuration method ☞ if you want to do an automatic configuration, press enter with automatic selec...

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    First-time configuration manual no. 775029 1-7 ❑ option 1: do an automatic configuration. The raid configuration summary screen is displayed showing the recommended configuration for your system (figure 1-4). Figure 1-4. Raid configuration summary screen table 1-2. Raid configuration summary fields ...

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    How do i configure a mylex controller for the first time? 1-8 raid ezassist user’s manual if there are more than five drives in the array, you’ll see a small down-arrow next to the disk drive display field. ☞ (optional): if there is a down-arrow next to the disk drive display field, press pgdn to se...

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    First-time configuration manual no. 775029 1-9 table 1-3. Raid configuration details fields ☛ note after viewing configuration details, press enter to select ok and return to the raid configuration summary screen. ☞ to apply the configuration, use the arrow key if necessary to select apply, then pre...

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    How do i configure a mylex controller for the first time? 1-10 raid ezassist user’s manual figure 1-6. Writing raid configuration. Please wait... ☞ wait for the configuration information to be written to the controller. Next you’ll see a configuration status screen (figure 1-7). Your automatic confi...

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    First-time configuration manual no. 775029 1-11 your next step will be to install the appropriate mylex disk array controller driver for the operating system you’ll be using on the computer in which the mylex raid controller is installed. • if you have not installed your operating system software ye...

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    How do i configure a mylex controller for the first time? 1-12 raid ezassist user’s manual ❑ option 2: do an assisted configuration. The sequence of screens displayed during an assisted configuration depends on several factors, such as the number of unconfigured drives on the controller and your res...

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    First-time configuration manual no. 775029 1-13 (striping) configuration may be more appropriate. ☞ if you want your array to be fault tolerant, press enter with yes selected. ☞ if you prefer a raid 0 striping or a jbod configuration and fault tolerance is not a consideration, use the arrow key to s...

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    How do i configure a mylex controller for the first time? 1-14 raid ezassist user’s manual figure 1-9. Do you want a spare drive? A spare drive (hot spare or standby drive) offers an additional level of fault tolerance for existing fault tolerant arrays. If a drive in the array fails, the presence o...

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    First-time configuration manual no. 775029 1-15 • fault tolerance = yes, and • number of available 1 drives on controller > 2 ☛ note if you have only two available drives on this controller, you’ll get a raid 1 (mirroring) configuration, which optimizes for performance. You will, therefore, not see ...

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    How do i configure a mylex controller for the first time? 1-16 raid ezassist user’s manual raid 5, but since the striped set is mirrored, available capacity is only half of the total capacity in the drive set. ☞ if you want to optimize your array for capacity, press enter with capacity selected. ☞ i...

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    First-time configuration manual no. 775029 1-17 figure 1-12. Logical drive count each logical drive that you create under assisted configuration will have identical capacity and settings (raid level, caching, etc.). If you wish to set logical drive capacities or settings individually, you must use c...

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    How do i configure a mylex controller for the first time? 1-18 raid ezassist user’s manual ■ capacity usage the capacity usage screen is always displayed in assisted configuration. You may use all or a part of the total available capacity to set up the specified number of logical drives with the opt...

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    First-time configuration manual no. 775029 1-19 ☞ if you want to use the maximum available capacity for these logical drives, press enter with ok selected. ☞ if you want to reserve some capacity for future use: ☞ press the up arrow key to select the capacity usage field. ☞ type in a number represent...

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    How do i configure a mylex controller for the first time? 1-20 raid ezassist user’s manual if there are more than five drives in the array, you’ll see a small down-arrow next to the disk drive display field. ☞ (optional): if there is a down-arrow next to the disk drive display field, press pgdn to s...

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    First-time configuration manual no. 775029 1-21 ☞ to apply the configuration, use the arrow key if necessary to select apply, then press enter, or ☞ to cancel the configuration, use the arrow key to select cancel, then press enter. When you apply the new configuration, raid ezassist writes configura...

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    How do i configure a mylex controller for the first time? 1-22 raid ezassist user’s manual next you’ll see a configuration status screen (figure 1-17). Your assisted configuration has been completed. Figure 1-17. Configuration complete - reboot or main menu your next step will be to install the appr...

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    First-time configuration manual no. 775029 1-23 ☞ refer to the disk array controller software kit installation guide and user manual or your mylex controller’s quick installation guide for further instructions. ❑ option 3: do a custom configuration. Custom configuration gives you full control over t...

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    How do i configure a mylex controller for the first time? 1-24 raid ezassist user’s manual figure 1-18. Custom configuration main menu we are setting up a first-time configuration, so we’ll use the menu’s first option: configure a new disk array. ☞ press enter with the configure a new disk array opt...

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    First-time configuration manual no. 775029 1-25 figure 1-19. Disk array configuration screen this screen uses the following navigation strategy: • pgdn and pgup show you all the available drives if there is a small down-arrow beside the unused drives field. • inside unused drives, arrow keys select ...

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    How do i configure a mylex controller for the first time? 1-26 raid ezassist user’s manual the answer depends on the raid levels you want to be able to choose for the logical drives you’ll set up in that array. See table 1-4. Table 1-4. Required numbers of drives by raid level ☞ use the arrow keys t...

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    First-time configuration manual no. 775029 1-27 ☞ if you’re not satisfied with your drive selections, use the arrow key to select clear, then press enter. Press tab to return to unused drives. Your selections will be erased and you can try again as described above. ☞ to save the array you’ve set up,...

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    How do i configure a mylex controller for the first time? 1-28 raid ezassist user’s manual if you plan on only one array, or if you’d prefer to define logical drives before building any additional arrays, you should move on to define logical drives at this time. ☞ to build additional disk arrays, us...

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    First-time configuration manual no. 775029 1-29 option is visible, use the arrow key to move to another field. • for physical capacity or logical capacity definition fields, type a numeric decimal value representing the desired capacity in gb. You may choose one or the other field to adjust. • the t...

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    How do i configure a mylex controller for the first time? 1-30 raid ezassist user’s manual next, we’ll select the write caching strategy for our logical drive. If you are unfamiliar with the terms “write through” and “write back” caching, please refer to the glossary for a detailed definition. In a ...

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    First-time configuration manual no. 775029 1-31 next, we set a size for this logical drive based on the maximum available capacity. You can set logical drive size in terms of either physical capacity or logical capacity. Logical capacity takes into account overhead for fault tolerance, spare drives,...

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    How do i configure a mylex controller for the first time? 1-32 raid ezassist user’s manual the logical drive is added to the display box, and focus returns to the logical drive definition field line (figure 1-25). Figure 1-25. Logical drive has been added ☞ to define additional logical drives, use t...

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    First-time configuration manual no. 775029 1-33 ■ apply the configuration to the controller. In order for the disk arrays and logical drives you set up to become a valid, registered configuration, you must apply the configuration to the controller. ☞ to apply the configuration, press tab if necessar...

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    How do i configure a mylex controller for the first time? 1-34 raid ezassist user’s manual when the process is complete, raid ezassist brings you to the main menu (figure 1-27). Figure 1-27. Configuration complete - go to main menu your next step will be to install the appropriate mylex disk array c...

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    First-time configuration manual no. 775029 1-35 figure 1-28. Do you wish to exit raid ezassist? ☞ use the arrow key to select yes, then press enter to exit raid ezassist. The system reboots. Begin operating system installation if necessary, or allow your installed operating system to boot. ☞ refer t...

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    How do i configure multiple mylex controllers? 1-36 raid ezassist user’s manual how do i configure multiple mylex controllers? ❑ power on your system. Regardless of whether an operating system is installed on your computer system, you can run raid ezassist from the mylex controller’s bios at system ...

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    First-time configuration manual no. 775029 1-37 ❑ get started. Raid ezassist always starts by scanning for mylex controllers and target drives (figure 1-29). Figure 1-29. Raid ezassist scans for controllers and drives ☞ allow scanning to complete. Since this is a first-time configuration, you’ll see...

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    How do i configure multiple mylex controllers? 1-38 raid ezassist user’s manual “would you like to configure a raid drive now?” the answer depends in part on whether you want to change any of the default parameters and settings for this mylex raid controller. If you are a new or inexperienced user, ...

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    First-time configuration manual no. 775029 1-39 figure 1-31. Select a controller this screen uses the following navigation strategy: • arrow keys move among the available controllers. • enter selects the highlighted controller. ☞ use the arrow keys to select a controller from the list, then press en...

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    How do i configure multiple mylex controllers? 1-40 raid ezassist user’s manual figure 1-32. Select “configure a raid drive” ☞ from the main menu, press enter with configure a raid drive selected (figure 1-32). At this time, please continue from the “choose a configuration method” step in “how do i ...

  • Page 49: Chapter 2

    Manual no. 775029 2-1 chapter 2 drive configuration this chapter will provide a detailed description of how to configure disk drives using raid ezassist. Chapter 1 focused on first-time configuration of drives. Chapter 2 will cover some of the same topics, but will launch into more advanced configur...

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    How do i start raid ezassist? 2-2 raid ezassist user’s manual ☛ note if the second line reads “bios is disabled,” you must press to enter the bios options menu and enable the bios. If you don’t, you won’t be able to run raid ezassist from this controller’s bios. Next you’ll see: press for raid confi...

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    Drive configuration manual no. 775029 2-3 figure 2-1. Raid ezassist scans for controllers and drives ☞ allow scanning to complete. How do i begin to configure a mylex controller? What happens after raid ezassist starts up depends on the answers to the following questions: 1. Are there multiple mylex...

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    How do i begin to configure a mylex controller? 2-4 raid ezassist user’s manual figure 2-2. Do you want to configure the unconfigured drive(s)? ☞ to configure the unconfigured drives, press enter with yes selected, or ☞ if you want to do something besides drive configuration, use the arrow key to se...

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    Drive configuration manual no. 775029 2-5 figure 2-3. Raid ezassist main menu refer to chapter 3 if you’ll be doing controller configuration, to chapter 4 if you’ll be doing a monitoring or maintenance activity, or to chapter 5 if you want to use any advanced options. ☛ note if you really do intend ...

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    How do i choose a configuration method? 2-6 raid ezassist user’s manual table 2-1. Selecting a configuration method configuration method who should use it what it does automatic -novice users with little or no raid experience. -users who wish to set up a single array with one logical drive when all ...

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    Drive configuration manual no. 775029 2-7 you choose your configuration method from the configure raid drive screen (figure 2-4). Figure 2-4. Choose a configuration method ☞ if you want to do an automatic configuration, press enter with automatic selected. Now see “how do i do an automatic configura...

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    How do i do an automatic configuration? 2-8 raid ezassist user’s manual how do i do an automatic configuration? The raid configuration summary screen is displayed (figure 2-5). Figure 2-5. Raid configuration summary screen table 2-2. Raid configuration summary fields field description fault toleranc...

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    Drive configuration manual no. 775029 2-9 if there are more than five drives in the array, you’ll see a small down-arrow next to the disk drive display field. ☞ (optional): if there is a down-arrow next to the disk drive display field, press pgdn to see the additional disk drives in the array. ☞ (op...

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    How do i do an automatic configuration? 2-10 raid ezassist user’s manual table 2-3. Raid configuration details fields ☛ note after viewing configuration details, press enter to select ok and return to the raid configuration summary screen. ☞ to apply the configuration, use the arrow key if necessary...

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    Drive configuration manual no. 775029 2-11 figure 2-7. Writing raid configuration. Please wait... ☞ wait for the configuration information to be written to the controller. Next you’ll see a configuration status screen (figure 2-8). Your automatic configuration has been completed. Figure 2-8. Configu...

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    How do i do an automatic configuration? 2-12 raid ezassist user’s manual ☞ to exit raid ezassist, press enter with the reboot button selected, or ☞ to continue using raid ezassist, use the arrow key to select main menu, then press enter. When the main menu appears: • look in this chapter if you’ll b...

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    Drive configuration manual no. 775029 2-13 how do i do an assisted configuration? The sequence of screens displayed during an assisted configuration depends on several factors, such as the number of unconfigured drives on the controller and your responses at each step of the assisted configuration p...

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    How do i do an assisted configuration? 2-14 raid ezassist user’s manual (striping) configuration may be more appropriate. ☞ if you want your array to be fault tolerant, press enter with yes selected. ☞ if you prefer a raid 0 striping or a jbod configuration and fault tolerance is not a consideration...

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    Drive configuration manual no. 775029 2-15 figure 2-10. Do you want a spare drive? A spare drive (hot spare or standby drive) offers an additional level of fault tolerance for existing fault tolerant arrays. If a drive in the array fails, the presence of a spare drive allows the failed drive’s data ...

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    How do i do an assisted configuration? 2-16 raid ezassist user’s manual ❑ optimization priority the optimization priority screen is displayed under the following conditions: • fault tolerance = yes, and • number of available 1 drives on controller > 2 ☛ note if you have only two available drives on ...

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    Drive configuration manual no. 775029 2-17 performance, you’ll be requesting a raid 0+1 (striping with mirroring) configuration. Both give you the safety of fault tolerance. Raid 5 provides the best combination of settings for most applications and has overhead of only one drive’s capacity. Raid 0+1...

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    How do i do an assisted configuration? 2-18 raid ezassist user’s manual ❑ logical drive count the logical drive count screen is always displayed in assisted configuration. You may divide the available drive space into multiple logical drives, or retain the default of one (1) logical drive. The logic...

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    Drive configuration manual no. 775029 2-19 ❑ capacity usage the capacity usage screen is always displayed in assisted configuration. You may use all or a part of the total available capacity to set up the specified number of logical drives with the optimization you’ve selected previously. The capaci...

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    How do i do an assisted configuration? 2-20 raid ezassist user’s manual ☞ press the down arrow key to select ok. ☞ press enter with ok selected. ❑ apply the configuration to the controller. The raid configuration summary screen is displayed (figure 2-15). Figure 2-15. Raid configuration summary scre...

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    Drive configuration manual no. 775029 2-21 figure 2-16. Raid configuration details screen ☛ note after viewing configuration details, press enter to select ok and return to the raid configuration summary screen. ☞ to apply the configuration, use the arrow key if necessary to select apply, then press...

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    How do i do an assisted configuration? 2-22 raid ezassist user’s manual figure 2-17. Writing raid configuration. Please wait... ☞ wait for the configuration information to be written to the controller. Next you’ll see a configuration status screen (figure 2-18). Your assisted configuration has been ...

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    Drive configuration manual no. 775029 2-23 ☞ to exit raid ezassist, press enter with the reboot button selected, or ☞ to continue using raid ezassist, use the arrow key to select main menu, then press enter. When the main menu appears: • look in this chapter if you’ll be doing an additional configur...

  • Page 72

    How do i do a custom configuration? 2-24 raid ezassist user’s manual how do i do a custom configuration? Custom configuration gives you full control over the configuration of your disk drives. With custom configuration, you can: • select individual disk drives to add to the configuration • build mul...

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    Drive configuration manual no. 775029 2-25 figure 2-19. Custom configuration menu the first option on the menu, “configure a new disk array,” is used to build new disk arrays, then optionally define logical drives from them. If you want to add capacity to an existing disk array, see “how do i add ca...

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    How do i do a custom configuration? 2-26 raid ezassist user’s manual ❑ build disk arrays. The first step in custom configuration is to build at least one disk array. This is accomplished from the disk array configuration screen (figure 2-20). Figure 2-20. Disk array configuration screen this screen ...

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    Drive configuration manual no. 775029 2-27 “how many drives should i select for an array?” the answer depends on the raid levels you want to be able to choose for the logical drives you’ll set up in that array. See table 2-4. Table 2-4. Required numbers of drives by raid level ☞ use the arrow keys t...

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    How do i do a custom configuration? 2-28 raid ezassist user’s manual ☞ if you’re not satisfied with your drive selections, use the arrow key to select clear, then press enter. Press tab to return to unused drives. Your selections will be erased and you can try again as described above. ☞ to save the...

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    Drive configuration manual no. 775029 2-29 if you plan on only one array, or if you’d prefer to define logical drives before building any additional arrays, you should move on to define logical drives at this time. ☞ to build additional disk arrays, use the arrow key if necessary to select no, then ...

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    How do i do a custom configuration? 2-30 raid ezassist user’s manual option is visible, use the arrow key to move to another field. • for physical capacity or logical capacity definition fields, type a numeric decimal value representing the desired capacity in gb. You may choose one or the other fie...

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    Drive configuration manual no. 775029 2-31 if you are unfamiliar with the terms “write through” and “write back” caching, please refer to the glossary for a detailed definition. In a nutshell, write back caching speeds write performance but risks loss of data in the cache buffer should power fail. U...

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    How do i do a custom configuration? 2-32 raid ezassist user’s manual ☞ if the stripe size(kb) definition field is changeable (is displayed in cyan color), use the right arrow key to select the stripe size(kb) definition field, then... ☞ press the + or - key to find your desired stripe size, or ☞ pre...

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    Drive configuration manual no. 775029 2-33 figure 2-25. Ready to add the logical drive the logical drive is added to the display box, and focus returns to the logical drive definition field line if capacity remains for additional logical drives (figure 2-26). Figure 2-26. Logical drive has been adde...

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    How do i do a custom configuration? 2-34 raid ezassist user’s manual ☞ to define additional logical drives, use the arrow key if necessary to return to the raid level definition field. Repeat the steps described in “define logical drives.” as long as you haven’t applied the configuration to the cont...

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    Drive configuration manual no. 775029 2-35 figure 2-27. Writing raid configuration. Please wait... ☞ wait for the configuration information to be written to the controller. When the process is complete, raid ezassist brings you to the main menu (figure 2-28). Figure 2-28. Configuration complete - go...

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    How do i do a custom configuration? 2-36 raid ezassist user’s manual when the main menu appears: • look in this chapter if you’ll be doing an additional configuration activity. • refer to chapter 3 if you’ll be doing controller configuration. • refer to chapter 4 if you’ll be doing a monitoring or m...

  • Page 85

    Drive configuration manual no. 775029 2-37 how do i add capacity to an existing disk array? Raid ezassist gives you the option of adding capacity to existing disk arrays. This process is referred to as mylex online raid expansion™ (more™). The process allows you to increase the useable space in an a...

  • Page 86

    How do i add capacity to an existing disk array? 2-38 raid ezassist user’s manual ☞ on the configure raid drive screen, use the arrow key to select custom, then press enter (figure 2-30). Figure 2-30. Configure raid drive - custom the custom configuration menu is displayed (figure 2-31). Figure 2-31...

  • Page 87

    Drive configuration manual no. 775029 2-39 custom configuration menu, then press enter. ☛ note if any one of the conditions described below is true, the add capacity to existing disk array function will not be possible: all available drives on the controller are already configured (often resulting f...

  • Page 88

    How do i add capacity to an existing disk array? 2-40 raid ezassist user’s manual figure 2-32. Disk array selection screen this screen uses the following navigation strategy: • arrow keys move among the available disk arrays. • enter selects the highlighted disk array. ☞ use the arrow keys to select...

  • Page 89

    Drive configuration manual no. 775029 2-41 figure 2-33. Disk array configuration screen this screen uses the following navigation strategy: • pgdn and pgup show you all the available or selected drives if there is a small down/up-arrow beside the unused drives or disk array fields. • inside unused d...

  • Page 90

    How do i add capacity to an existing disk array? 2-42 raid ezassist user’s manual ☞ (optional): if there is a small down-arrow or up-arrow to the right of the disk array field, use pgdn or pgup to view the additional drives in the disk array. ☞ use the arrow keys to select a disk drive in the unused...

  • Page 91

    Drive configuration manual no. 775029 2-43 ☞ to save the expanded array configuration you’ve set up, press enter with save array selected. A notice is displayed at this point as shown in figure 2-35. Figure 2-35. Define logical drives or return to add capacity set-up you should define your additiona...

  • Page 92

    How do i add capacity to an existing disk array? 2-44 raid ezassist user’s manual figure 2-36. Logical drive definition screen this screen uses the following navigation strategy: • arrow keys move among the logical drive definition fields. • for raid level, write cache, and stripe size(kb) 1 definit...

  • Page 93

    Drive configuration manual no. 775029 2-45 let’s start by selecting a raid level for our logical drive. ☞ with the raid level definition field selected... ☞ press the + or - key to find your desired raid level, or ☞ press spacebar to display a box of available choices, use the arrow key to select yo...

  • Page 94

    How do i add capacity to an existing disk array? 2-46 raid ezassist user’s manual if you are unfamiliar with the term “stripe size” please refer to the glossary for a detailed definition. ☛ note if this is the first logical drive on this controller, the stripe size you select for the first logical d...

  • Page 95

    Drive configuration manual no. 775029 2-47 ☞ if you wish to change any settings, use the arrow key to select the desired definition field and change its value as described earlier. ☞ to add the logical drive, press the tab key to switch focus to the add drive button, then press enter with add drive ...

  • Page 96

    How do i add capacity to an existing disk array? 2-48 raid ezassist user’s manual figure 2-37. Expanded array configuration with logical drives ☞ to apply the new expanded configuration, press tab if necessary to switch focus to the buttons, use the arrow key to select apply, then press enter, or ☞ ...

  • Page 97

    Drive configuration manual no. 775029 2-49 figure 2-38. Writing raid configuration. Please wait... ☞ wait for the configuration information to be written to the controller. When the process is complete, raid ezassist brings you to the main menu (figure 2-39). Figure 2-39. Configuration complete - go...

  • Page 98

    How do i add capacity to an existing disk array? 2-50 raid ezassist user’s manual when the main menu appears: • look in this chapter if you’ll be doing an additional configuration activity. • refer to chapter 3 if you’ll be doing controller configuration. • refer to chapter 4 if you’ll be doing a mo...

  • Page 99

    Drive configuration manual no. 775029 2-51 how do i define additional logical drives? ☞ from the main menu, press enter with configure raid drive selected (figure 2-40). Figure 2-40. Main menu - configure raid drive ☞ on the configure raid drive screen, use the arrow key to select custom, then press...

  • Page 100

    How do i define additional logical drives? 2-52 raid ezassist user’s manual the custom configuration menu is displayed (figure 2-42). Figure 2-42. Custom configuration menu ☞ if you want to define logical drives from existing disk arrays, use the arrow key to select define logical drive(s) on the cu...

  • Page 101

    Drive configuration manual no. 775029 2-53 figure 2-43. Logical drive definition screen this screen uses the following navigation strategy: • arrow keys move among the logical drive definition fields. • for raid level, write cache, and stripe size(kb) definition fields, the spacebar brings up a list...

  • Page 102

    How do i define additional logical drives? 2-54 raid ezassist user’s manual ☞ with the raid level definition field selected... ☞ press the + or - key to find your desired raid level, or ☞ press spacebar to display a box of available choices, use the arrow key to select your desired raid level, then ...

  • Page 103

    Drive configuration manual no. 775029 2-55 ☛ note if this is the first logical drive on this controller, the stripe size you select for the first logical drive will be fixed for all subsequent logical drives in all arrays on the controller. Available stripe sizes are 8, 16, 32, and 64. ☞ if the stri...

  • Page 104

    How do i define additional logical drives? 2-56 raid ezassist user’s manual earlier. ☞ to add the logical drive, press the tab key to switch focus to the add drive button, then press enter with add drive selected. The logical drive is added to the display box, and focus returns to the logical drive ...

  • Page 105

    Drive configuration manual no. 775029 2-57 press enter. When you apply the new configuration, raid ezassist writes configuration information to the mylex controller. This takes a few moments, so a message is displayed (figure 2-44). Figure 2-44. Writing raid configuration. Please wait... ☞ wait for ...

  • Page 106

    How do i define additional logical drives? 2-58 raid ezassist user’s manual figure 2-45. Configuration complete - go to main menu when the main menu appears: • look in this chapter if you’ll be doing an additional configuration activity. • refer to chapter 3 if you’ll be doing controller configurati...

  • Page 107

    Drive configuration manual no. 775029 2-59 how do i assign additional spare drives? ☞ from the main menu, press enter with configure raid drive selected (figure 2-46). Figure 2-46. Main menu - configure raid drive ☞ on the configure raid drive screen, use the arrow key to select custom, then press e...

  • Page 108

    How do i assign additional spare drives? 2-60 raid ezassist user’s manual the custom configuration menu is displayed (figure 2-48). Figure 2-48. Custom configuration menu ☞ if you want to assign any currently unconfigured drives as additional spare drives , use the arrow key to select assign spare d...

  • Page 109

    Drive configuration manual no. 775029 2-61 figure 2-49. Physical drive selection screen this screen uses the following navigation strategy: • arrow keys move among the defined physical devices. • enter selects the highlighted physical device. ☞ use the arrow keys to select a physical drive with curr...

  • Page 110

    How do i assign additional spare drives? 2-62 raid ezassist user’s manual figure 2-50. Designate drive as spare confirmation ☞ to apply the configuration, use the arrow key to select yes if necessary, then press enter. Or ☞ to cancel the configuration change, use the arrow key to select no if necess...

  • Page 111

    Drive configuration manual no. 775029 2-63 figure 2-51. Writing raid configuration. Please wait... ☞ wait for the configuration information to be written to the controller. When the process is complete, raid ezassist brings you back to the main menu (figure 2-52), or to select a controller if there ...

  • Page 112

    How do i assign additional spare drives? 2-64 raid ezassist user’s manual ☞ to assign additional spare drives, repeat the procedure described in this section. When the main menu appears: • look in this chapter if you’ll be doing an additional configuration activity. • refer to chapter 3 if you’ll be...

  • Page 113

    Drive configuration manual no. 775029 2-65 how do i unassign existing spare drives? ☞ from the main menu, press enter with configure raid drive selected (figure 2-53). Figure 2-53. Main menu - configure raid drive ☞ on the configure raid drive screen, use the arrow key to select custom, then press e...

  • Page 114

    How do i unassign existing spare drives? 2-66 raid ezassist user’s manual the custom configuration menu is displayed (figure 2-55). Figure 2-55. Custom configuration menu ☞ if you want to unassign any existing spare drives to return them to unconfigured status, use the arrow key to select assign spa...

  • Page 115

    Drive configuration manual no. 775029 2-67 figure 2-56. Physical drive selection screen this screen uses the following navigation strategy: • arrow keys move among the defined physical drives. • enter selects the highlighted physical drive. ☞ use the arrow keys to select a physical drive with curren...

  • Page 116

    How do i unassign existing spare drives? 2-68 raid ezassist user’s manual figure 2-57. Designate drive as unused confirmation ☞ to apply the configuration, use the arrow key to select yes, then press enter, or ☞ to cancel the configuration change, press enter with no selected. When you apply the new...

  • Page 117

    Drive configuration manual no. 775029 2-69 figure 2-58. Writing raid configuration. Please wait... ☞ wait for the configuration information to be written to the controller. When the process is complete, raid ezassist brings you back to the main menu (figure 2-59), or to select a controller if there ...

  • Page 118

    How do i unassign existing spare drives? 2-70 raid ezassist user’s manual ☞ to unassign other spare drives, repeat the procedure described in this section. When the main menu appears: • look in this chapter if you’ll be doing an additional configuration activity. • refer to chapter 3 if you’ll be do...

  • Page 119

    Drive configuration manual no. 775029 2-71 how do i make use of the spanning feature? “spanning” is the concept of linking similar disk arrays so that logical drives can make use of the extended capacity across the disk arrays. When to use spanning spanning is generally useful in the following types...

  • Page 120

    How do i make use of the spanning feature? 2-72 raid ezassist user’s manual which to define logical drives. Therefore, the largest logical drive i can define would make use of the full 18.0 gb in both arrays. ☛ note in the examples above, keep in mind that actual available “logical” capacity for def...

  • Page 121

    Drive configuration manual no. 775029 2-73 3. For spanning, capacity of the drives in a disk array does not need to be the same, but each disk array must have the same number of physical drives and be defined consecutively. To avoid downsizing of drives, build each disk array with drives of the same...

  • Page 122

    How do i make use of the spanning feature? 2-74 raid ezassist user’s manual ❑ enable (or disable) spanning. ☞ if the main menu is displayed, press enter with configure raid drive selected (figure 2-60). Figure 2-60. Main menu - configure raid drive ☞ on the configure raid drive screen, use the arrow...

  • Page 123

    Drive configuration manual no. 775029 2-75 the custom configuration menu is displayed (figure 2-62). Figure 2-62. Custom configuration menu ☞ if you want to see whether spanning is turned on, or if you want to enable (or disable) the spanning feature, use the arrow key to select spanning on the cust...

  • Page 124

    How do i make use of the spanning feature? 2-76 raid ezassist user’s manual figure 2-63. Enable spanning? ☞ if you want to enable spanning, use the arrow key to select yes, then press enter, or ☞ if you don’t want to enable spanning, press enter with no selected. However, if spanning is currently en...

  • Page 125

    Drive configuration manual no. 775029 2-77 figure 2-64. Disable spanning? ☞ if you want to disable spanning, press enter with yes selected, or ☞ if you don’t want to disable spanning, use the arrow key to select no, then press enter..

  • Page 126

    How do i make use of the spanning feature? 2-78 raid ezassist user’s manual ❑ build disk arrays. ☞ from the custom configuration menu, use the arrow key to select configure a new disk array, then press enter (figure 2-65). Figure 2-65. Select configure a new disk array the first step is to build at ...

  • Page 127

    Drive configuration manual no. 775029 2-79 figure 2-66. Disk array configuration screen this screen uses the following navigation strategy: • pgdn and pgup show you all the available or selected drives if there is a small down/up-arrow beside the unused drives or disk array fields. • inside unused d...

  • Page 128

    How do i make use of the spanning feature? 2-80 raid ezassist user’s manual the answer depends on the raid levels you want to be able to choose for the logical drives you’ll set up in that array. See table 2-7. Table 2-7. Required numbers of drives by raid level ☞ use the arrow keys to select a disk...

  • Page 129

    Drive configuration manual no. 775029 2-81 ☞ if you’re not satisfied with your drive selections, use the arrow key to select clear, then press enter. Press tab to return to unused drives. Your selections will be erased and you can try again as described above. ☞ to save the array you’ve set up, pres...

  • Page 130

    How do i make use of the spanning feature? 2-82 raid ezassist user’s manual ❑ define logical drives. Logical drives for the spanned array(s) you just set up are defined from the logical drive definition screen (figure 2-69). Just under the screen title, you’ll see the names of the arrays that are sp...

  • Page 131

    Drive configuration manual no. 775029 2-83 activates the highlighted button. Arrow keys rotate selections through add drive, apply, cancel, clear all, and delete last. Let’s start by selecting a raid level for our logical drive. ☞ with the raid level definition field selected... ☞ press the + or - k...

  • Page 132

    How do i make use of the spanning feature? 2-84 raid ezassist user’s manual ☛ note the stripe size you select for the first logical drive will be fixed for all subsequent logical drives in all arrays on the controller. Available stripe sizes are 8, 16, 32, and 64. ☞ use the right arrow key to select...

  • Page 133

    Drive configuration manual no. 775029 2-85 ☞ if you wish to change any settings, use the arrow key to select the desired definition field and change its value as described earlier. ☞ to add the logical drive, press the tab key to switch focus to the add drive button, then press enter with add drive ...

  • Page 134

    How do i make use of the spanning feature? 2-86 raid ezassist user’s manual ☞ to apply the configuration, press tab if necessary to switch focus to the buttons, use the arrow key to select apply, then press enter, or ☞ to cancel the configuration, press tab if necessary to switch focus to the button...

  • Page 135

    Drive configuration manual no. 775029 2-87 figure 2-71. Configuration complete - go to main menu when the main menu appears: • look in this chapter if you’ll be doing an additional configuration activity. • refer to chapter 3 if you’ll be doing controller configuration. • refer to chapter 4 if you’l...

  • Page 136

    How do i exit raid ezassist? 2-88 raid ezassist user’s manual how do i exit raid ezassist? ☞ to exit raid ezassist from the main menu, press the esc key, or ☞ to exit raid ezassist when you’re not at the main menu, press the esc key until you reach the main menu, then press esc one more time. You’ll...

  • Page 137: Chapter 3

    Manual no. 775029 3-1 chapter 3 controller configuration you can use raid ezassist to view a controller’s current configuration settings. Additionally, you can change certain settings on your controller. Each mylex disk array controller is shipped from the factory with default settings which have be...

  • Page 138

    How do i view controller configuration information? 3-2 raid ezassist user’s manual if you wish to view and/or modify any global properties for the selected mylex controller, see the section called “how do i change global properties for a controller?” on page 3-4. If you wish to view and/or modify a...

  • Page 139

    Controller configuration manual no. 775029 3-3 figure 3-2. Controller configuration screen ❑ examine the controller configuration details. Table 3-2 shows the information displayed on the controller configuration screen. This information is read only..

  • Page 140

    How do i change global properties for a controller? 3-4 raid ezassist user’s manual table 3-2. Controller configuration details ☞ view the controller configuration information, then press the esc key to return to the main menu. However, if you want to change any controller properties, see one of the...

  • Page 141

    Controller configuration manual no. 775029 3-5 figure 3-3. Properties menu overlays controller configuration screen ❑ enter the global properties screen. ☞ when the properties menu is displayed, press enter with global selected. The global properties screen is displayed (figure 3-4). Figure 3-4. Glo...

  • Page 142

    How do i change global properties for a controller? 3-6 raid ezassist user’s manual this screen uses the following navigation strategy: • arrow keys move among the global property fields. • the spacebar brings up a list of valid options. Arrow keys move among the options and enter selects an option....

  • Page 143

    Controller configuration manual no. 775029 3-7 ❑ view/modify storageworks(tm) fault management. Default = disabled the storageworks fault management (tm) option monitors and reports drive failures, background activity completion status, enclosure events, etc. Enable this function only when digital s...

  • Page 144

    How do i change global properties for a controller? 3-8 raid ezassist user’s manual ☞ use the arrow key to select the background process rate (%) field, then... ☞ press the + or - key to select the desired numeric value for background processes, or ☞ press spacebar to display a box of available choi...

  • Page 145

    Controller configuration manual no. 775029 3-9 how do i change scsi transfer properties for a controller? ❑ enter the properties menu. To view and possibly change scsi transfer properties of the controller, you enter the properties menu from the controller configuration screen. ☞ press enter with pr...

  • Page 146

    How do i change scsi transfer properties for a controller? 3-10 raid ezassist user’s manual figure 3-6. Scsi transfer properties screen this screen uses the following navigation strategy: • arrow keys move among the scsi transfer property fields. • the spacebar brings up a list of valid options. Arr...

  • Page 147

    Controller configuration manual no. 775029 3-11 ❑ view/modify bus speed. Default = 20mhz the scsi transfer bus speed (mhz) function sets the maximum transfer rate for each drive channel. The default setting is 20mhz. This setting produces 20 mb/sec transfers for fast scsi and 40 mb/sec transfers for...

  • Page 148

    How do i change scsi transfer properties for a controller? 3-12 raid ezassist user’s manual ☞ use the arrow keys to select the tag queueing field for the desired channel, then... ☞ press the + or - key to set the value to yes or no as desired, or ☞ press spacebar to display a box of available choice...

  • Page 149

    Controller configuration manual no. 775029 3-13 how do i change startup properties for a controller? ❑ enter the properties menu. To view and possibly change startup properties of the controller, you enter the properties menu from the controller configuration screen. ☞ press enter with properties se...

  • Page 150

    How do i change startup properties for a controller? 3-14 raid ezassist user’s manual figure 3-8. Startup properties screen this screen uses the following navigation strategy: • arrow keys move among the startup property fields. • for the disk spin up field, the spacebar brings up a list of valid op...

  • Page 151

    Controller configuration manual no. 775029 3-15 ❑ view/modify the disk spin up setting. Default = by controller the disk spin up setting controls how the scsi drives in the array are started (spun-up). There are three different spin-up modes that may be selected by the user. By controller. This spin...

  • Page 152

    How do i change startup properties for a controller? 3-16 raid ezassist user’s manual ❑ view/modify the initial delay setting. Default = 6 after the controller completes its initialization process, the initial delay value defines the number of seconds before the first disk interrogation request is i...

  • Page 153: Chapter 4

    Manual no. 775029 4-1 chapter 4 monitoring and maintenance activities in this chapter you’ll learn how to work with: • disk arrays • logical drives • physical devices raid ezassist allows you to monitor characteristics and status, change certain properties of logical and physical drives, and perform...

  • Page 154

    4-2 raid ezassist user’s manual here is a list of the tasks that you can accomplish: disk array tasks: • view a list of the physical drives that make up the selected disk array, capacity and status of the drives, and the amount of unused space in the disk array. Logical drive tasks: • view propertie...

  • Page 155

    Monitoring and maintenance activities manual no. 775029 4-3 • view either the primary drive defect list, or a list of “grown” defects which may have emerged more recently. This information can help you anticipate a drive that may eventually need replacement. • view a count of parity errors, soft err...

  • Page 156

    How do i view disk array status and information? 4-4 raid ezassist user’s manual how do i view disk array status and information? ☞ use the arrow key to select perform administration on... On the main menu, then press enter. The administration menu is displayed (figure 4-2). Figure 4-2. Administrati...

  • Page 157

    Monitoring and maintenance activities manual no. 775029 4-5 figure 4-3. Disk array selection screen this screen uses the following navigation strategy: • arrow keys move among the available disk arrays. • enter selects the highlighted disk array. ☞ use the arrow keys to select the disk array you wan...

  • Page 158

    How do i view disk array status and information? 4-6 raid ezassist user’s manual figure 4-4. Disk array configuration screen ☞ (optional): if a small down-arrow is displayed beside the physical drive field, press pgdn to view additional drives in the disk array. Press pgup to move up the list. ☞ pre...

  • Page 159

    Monitoring and maintenance activities manual no. 775029 4-7 how do i view logical drive status and information? ☞ use the arrow key to select perform administration on... On the main menu, then press enter. The administration menu is displayed (figure 4-5). Figure 4-5. Administration menu - logical ...

  • Page 160

    How do i view logical drive status and information? 4-8 raid ezassist user’s manual figure 4-6. Logical drive selection screen this screen uses the following navigation strategy: • arrow keys move among the available logical drives. • enter selects the highlighted logical drive. ☞ use the arrow keys...

  • Page 161

    Monitoring and maintenance activities manual no. 775029 4-9 figure 4-7. Logical drive menu - view or modify drive configuration ☞ press enter with view or modify drive configuration selected. The logical drive configuration screen for the selected logical drive is displayed (figure 4-8). This screen...

  • Page 162

    How do i view logical drive status and information? 4-10 raid ezassist user’s manual figure 4-8. Logical drive configuration screen ☞ (optional): if a small down-arrow is displayed beside the physical drive field, press pgdn to view additional drives used in this logical drive. Press pgup to move up...

  • Page 163

    Monitoring and maintenance activities manual no. 775029 4-11 how do i change logical drive read and write cache settings? If you are unfamiliar with the terms “read cache,” “read ahead,” “write cache,” “write through,” or “write back” caching, please refer to the glossary for a detailed definition. ...

  • Page 164

    How do i change logical drive read and write cache settings? 4-12 raid ezassist user’s manual once you’ve set the read cache and write cache as desired, ☞ press enter with ok selected to accept the changes, or ☞ use the arrow key to select cancel, then press enter to leave the cache settings unchang...

  • Page 165

    Monitoring and maintenance activities manual no. 775029 4-13 how do i view the logical drive bad data table? ☞ use the arrow key to select perform administration on... On the main menu, then press enter. The administration menu is displayed (figure 4-10). Figure 4-10. Administration menu - logical d...

  • Page 166

    How do i view the logical drive bad data table? 4-14 raid ezassist user’s manual figure 4-11. Logical drive selection screen this screen uses the following navigation strategy: • arrow keys move among the available logical drives. • enter selects the highlighted logical drive. ☞ use the arrow keys t...

  • Page 167

    Monitoring and maintenance activities manual no. 775029 4-15 figure 4-12. Logical drive menu - view bad data table ☞ use the arrow key to select view bad data table, then press enter. The bad data table screen for the selected logical drive is displayed (figure 4-13). This screen shows the following...

  • Page 168

    How do i view the logical drive bad data table? 4-16 raid ezassist user’s manual figure 4-13. Bad data table ☞ press enter with ok selected when you have finished viewing the bad data table for this logical drive..

  • Page 169

    Monitoring and maintenance activities manual no. 775029 4-17 how do i visually locate the physical drives that comprise the logical drive? Raid ezassist has an option that allows you to see exactly which physical drives were used to define the selected logical drive. Using locate drive, you can caus...

  • Page 170

    How do i visually locate the physical drives that comprise the logical drive? 4-18 raid ezassist user’s manual figure 4-15. Logical drive selection screen this screen uses the following navigation strategy: • arrow keys move among the available logical drives. • enter selects the highlighted logical...

  • Page 171

    Monitoring and maintenance activities manual no. 775029 4-19 figure 4-16. Logical drive menu - locate drive ☞ use the arrow key to select locate drive, then press enter. A notice is displayed for the selected logical drive (figure 4-17). At the same time, all the physical drives that comprise the lo...

  • Page 172

    How do i visually locate the physical drives that comprise the logical drive? 4-20 raid ezassist user’s manual figure 4-17. Locate physical drives notice ☞ press enter with ok selected after you’ve visually located the physical drives. When the notice screen disappears, the leds should stop blinking...

  • Page 173

    Monitoring and maintenance activities manual no. 775029 4-21 how do i run a consistency check on the logical drive? From time to time it’s wise to check the parity on your fault tolerant logical drives for consistency, and to restore consistency if necessary. You do this by using the check consisten...

  • Page 174

    How do i run a consistency check on the logical drive? 4-22 raid ezassist user’s manual figure 4-19. Logical drive selection screen this screen uses the following navigation strategy: • arrow keys move among the available logical drives. • enter selects the highlighted logical drive. ☞ use the arrow...

  • Page 175

    Monitoring and maintenance activities manual no. 775029 4-23 figure 4-20. Logical drive menu - advanced options ☞ use the arrow key to select advanced options, then press enter. The logical drive advanced options menu is displayed (figure 4-21). Figure 4-21. Logical drive advanced options menu - che...

  • Page 176

    How do i run a consistency check on the logical drive? 4-24 raid ezassist user’s manual ❑ run a consistency check. ☞ press enter with check consistency selected. The check consistency screen is displayed (figure 4-22): figure 4-22. Check consistency - repair inconsistent data? You can check consiste...

  • Page 177

    Monitoring and maintenance activities manual no. 775029 4-25 how do i initialize a logical drive? With the immediate raid availability feature built into mylex products, logical drives are initialized in the background just after they are configured. The logical drives can be used right away without...

  • Page 178

    How do i initialize a logical drive? 4-26 raid ezassist user’s manual figure 4-24. Logical drive selection screen this screen uses the following navigation strategy: • arrow keys move among the available logical drives. • enter selects the highlighted logical drive. ☞ use the arrow keys to select th...

  • Page 179

    Monitoring and maintenance activities manual no. 775029 4-27 figure 4-25. Logical drive menu - advanced options ☞ use the arrow key to select advanced options, then press enter. The logical drive advanced options menu is displayed (figure 4-26). Figure 4-26. Logical drive advanced options menu - ini...

  • Page 180

    How do i initialize a logical drive? 4-28 raid ezassist user’s manual ❑ initialize the logical drive. ☞ use the arrow key to select initialize drive, then press enter. The initialize drive warning screen is displayed (figure 4-27): figure 4-27. Initialize drive? Initialization will erase all data on...

  • Page 181

    Monitoring and maintenance activities manual no. 775029 4-29 how do i rebuild redundancy data onto a logical drive? One of the most important features of raid technology is fault tolerance (data redundancy). It’s the redundancy built into your raid 1 (10), raid 3 (30), raid 5 (50), and raid 0+1 (0+1...

  • Page 182

    How do i rebuild redundancy data onto a logical drive? 4-30 raid ezassist user’s manual ☞ ☞ ☞ ☞ use the arrow key to select perform administration on... On the main menu, then press enter. The administration menu is displayed (figure 4-28). Figure 4-28. Administration menu - logical drive ☞ use the ...

  • Page 183

    Monitoring and maintenance activities manual no. 775029 4-31 figure 4-29. Logical drive selection screen this screen uses the following navigation strategy: • arrow keys move among the available logical drives. • enter selects the highlighted logical drive. ☞ use the arrow keys to select the logical...

  • Page 184

    How do i rebuild redundancy data onto a logical drive? 4-32 raid ezassist user’s manual figure 4-30. Logical drive menu - advanced options ☞ use the arrow key to select advanced options, then press enter. The logical drive advanced options menu is displayed (figure 4-31). Figure 4-31. Logical drive ...

  • Page 185

    Monitoring and maintenance activities manual no. 775029 4-33 ❑ rebuild redundancy data on the logical drive. ☞ use the arrow key to select rebuild redundancy data, then press enter. The rebuild redundancy data warning screen is displayed (figure 4-32): figure 4-32. Rebuild redundancy data? Rebuild r...

  • Page 186

    How do i cancel a background task that’s running on a logical drive? 4-34 raid ezassist user’s manual how do i cancel a background task that’s running on a logical drive? One of the following tasks may be running in the background: • consistency check • drive initialization • redundancy data rebuild...

  • Page 187

    Monitoring and maintenance activities manual no. 775029 4-35 ☞ ☞ ☞ ☞ use the arrow key to select perform administration on... On the main menu, then press enter. The administration menu is displayed (figure 4-33). Figure 4-33. Administration menu - logical drive ☞ use the arrow key to select logical...

  • Page 188

    How do i cancel a background task that’s running on a logical drive? 4-36 raid ezassist user’s manual figure 4-34. Logical drive selection screen this screen uses the following navigation strategy: • arrow keys move among the available logical drives. • enter selects the highlighted logical drive. ☞...

  • Page 189

    Monitoring and maintenance activities manual no. 775029 4-37 figure 4-35. Logical drive menu - advanced options ☞ use the arrow key to select advanced options, then press enter. The logical drive advanced options menu is displayed (figure 4-36). Figure 4-36. Logical drive advanced options menu - can...

  • Page 190

    How do i cancel a background task that’s running on a logical drive? 4-38 raid ezassist user’s manual ❑ cancel the background task running on the logical drive. ☞ use the arrow key to select cancel background task, then press enter. The cancel background task warning screen is displayed (figure 4-37...

  • Page 191

    Monitoring and maintenance activities manual no. 775029 4-39 how do i view physical drive status and information? ☞ use the arrow key to select perform administration on... On the main menu, then press enter. The administration menu is displayed (figure 4-38). Figure 4-38. Administration menu - phys...

  • Page 192

    How do i view physical drive status and information? 4-40 raid ezassist user’s manual figure 4-39. Physical drive selection screen this screen uses the following navigation strategy: • arrow keys move among the available physical devices. • enter selects the highlighted physical device. ☞ use the ar...

  • Page 193

    Monitoring and maintenance activities manual no. 775029 4-41 figure 4-40. Physical drive menu - view or modify drive configuration ☞ press enter with view or modify drive configuration selected. The device configuration screen for the selected physical device is displayed (figure 4-41). This screen ...

  • Page 194

    How do i view physical drive status and information? 4-42 raid ezassist user’s manual figure 4-41. Device configuration screen ☞ press enter with ok selected to close the device configuration screen. If you want to change the read cache and/or write cache physical drive settings, please continue to ...

  • Page 195

    Monitoring and maintenance activities manual no. 775029 4-43 how do i change physical drive read and write cache settings? If you are unfamiliar with the terms “read cache,” “read ahead,” “write cache,” “write through,” or “write back” caching, please refer to the glossary for a detailed definition....

  • Page 196

    How do i change physical drive read and write cache settings? 4-44 raid ezassist user’s manual ☞ press enter with ok selected to accept the changes, or ☞ use the arrow key to select cancel, then press enter to leave the cache settings unchanged. If you made any changes and selected ok, the following...

  • Page 197

    Monitoring and maintenance activities manual no. 775029 4-45 how do i view the physical drive defect list? ☞ use the arrow key to select perform administration on... On the main menu, then press enter. The administration menu is displayed (figure 4-43). Figure 4-43. Administration menu - physical de...

  • Page 198

    How do i view the physical drive defect list? 4-46 raid ezassist user’s manual figure 4-44. Physical drive selection screen this screen uses the following navigation strategy: • arrow keys move among the available physical devices. • enter selects the highlighted physical device. ☞ use the arrow key...

  • Page 199

    Monitoring and maintenance activities manual no. 775029 4-47 figure 4-45. Physical drive menu - view defect list ☞ use the arrow key to select view defect list, then press enter. The defect list menu is displayed (figure 4-46). From this menu you can choose to view the primary defect list (defects r...

  • Page 200

    How do i view the physical drive defect list? 4-48 raid ezassist user’s manual figure 4-46. Defect list menu - primary ☞ to view the primary defect list, press enter with primary selected. The primary defect list screen for the selected physical drive is displayed, or a message that no defect list w...

  • Page 201

    Monitoring and maintenance activities manual no. 775029 4-49 figure 4-47. Defect list menu - grown ☞ to view the grown defect list, use the arrow key to select grown, then press enter. The grown defect list screen for the selected physical drive is displayed, or a message that no defect list was fou...

  • Page 202

    How do i view and reset physical drive error counts? 4-50 raid ezassist user’s manual how do i view and reset physical drive error counts? ☞ use the arrow key to select perform administration on... On the main menu, then press enter. The administration menu is displayed (figure 4-48). Figure 4-48. A...

  • Page 203

    Monitoring and maintenance activities manual no. 775029 4-51 figure 4-49. Physical drive selection screen this screen uses the following navigation strategy: • arrow keys move among the available physical devices. • enter selects the highlighted physical device. ☞ use the arrow keys to select the ph...

  • Page 204

    How do i view and reset physical drive error counts? 4-52 raid ezassist user’s manual figure 4-50. Physical drive menu - view error counts ☞ use the arrow key to select view error counts, then press enter. The error counts screen for the selected physical device is displayed (figure 4-51). This scre...

  • Page 205

    Monitoring and maintenance activities manual no. 775029 4-53 figure 4-51. Error counts screen ❑ reset physical drive error counts. After viewing and noting the error counts, you should reset the counts to zero (0) to grow a fresh list for future observation. ☞ press enter with reset counts selected ...

  • Page 206

    How do i designate a physical drive as a spare, or reset a spare drive as unused? 4-54 raid ezassist user’s manual how do i designate a physical drive as a spare, or reset a spare drive as unused? ☞ use the arrow key to select perform administration on... On the main menu, then press enter. The admi...

  • Page 207

    Monitoring and maintenance activities manual no. 775029 4-55 figure 4-53. Physical drive selection screen this screen uses the following navigation strategy: • arrow keys move among the available physical devices. • enter selects the highlighted physical device. ❑ option 1: assign the physical devic...

  • Page 208

    How do i designate a physical drive as a spare, or reset a spare drive as unused? 4-56 raid ezassist user’s manual figure 4-54. Physical drive menu - designate drive as spare/unused ☞ on the physical drive menu, use the arrow key to select designate drive as spare/unused, then press enter. ■ apply t...

  • Page 209

    Monitoring and maintenance activities manual no. 775029 4-57 figure 4-55. Designate drive as spare confirmation ☞ to apply the configuration, use the arrow key to select yes if necessary, then press enter. Or ☞ to cancel the configuration change, use the arrow key to select no if necessary, then pre...

  • Page 210

    How do i designate a physical drive as a spare, or reset a spare drive as unused? 4-58 raid ezassist user’s manual figure 4-56. Writing raid configuration. Please wait... ☞ wait for the configuration information to be written to the controller. ❑ option 2: return a spare drive to unconfigured (unuse...

  • Page 211

    Monitoring and maintenance activities manual no. 775029 4-59 ☞ in the physical drive selection screen (as in figure 4-57,for example) use the arrow keys to select a spare drive to return to unconfigured (unused) status, then press enter. The physical drive menu is displayed (figure 4-58). Figure 4-5...

  • Page 212

    How do i designate a physical drive as a spare, or reset a spare drive as unused? 4-60 raid ezassist user’s manual figure 4-59. Designate drive as unused confirmation ☞ to apply the configuration, use the arrow key to select yes if necessary, then press enter. Or ☞ to cancel the configuration change...

  • Page 213

    Monitoring and maintenance activities manual no. 775029 4-61 figure 4-60. Writing raid configuration. Please wait... ☞ wait for the configuration information to be written to the controller..

  • Page 214

    How do i visually locate a physical device? 4-62 raid ezassist user’s manual how do i visually locate a physical device? Raid ezassist has an option that allows you to see exactly where a particular physical device is located in your hardware setup. Using locate device, you can cause a selected phys...

  • Page 215

    Monitoring and maintenance activities manual no. 775029 4-63 figure 4-62. Physical drive selection screen this screen uses the following navigation strategy: • arrow keys move among the available physical devices. • enter selects the highlighted physical device. ☞ use the arrow keys to select the ph...

  • Page 216

    How do i visually locate a physical device? 4-64 raid ezassist user’s manual figure 4-63. Physical drive menu - locate device ☞ use the arrow key to select locate device, then press enter. A notice is displayed for the selected physical device (figure 4-64). At the same time, the physical device wil...

  • Page 217

    Monitoring and maintenance activities manual no. 775029 4-65 figure 4-64. Locate physical device notice ☞ press enter with ok selected after you’ve visually located the physical device. When the notice screen disappears, the led should stop blinking..

  • Page 218

    How do i rebuild redundancy data on a physical drive? 4-66 raid ezassist user’s manual how do i rebuild redundancy data on a physical drive? One of the most important features of raid technology is fault tolerance (data redundancy). It’s the redundancy built into your raid 1 (10), raid 3 (30), raid ...

  • Page 219

    Monitoring and maintenance activities manual no. 775029 4-67 ☞ ☞ ☞ ☞ use the arrow key to select perform administration on... On the main menu, then press enter. The administration menu is displayed (figure 4-65). Figure 4-65. Administration menu - physical device ☞ use the arrow key to select physi...

  • Page 220

    How do i rebuild redundancy data on a physical drive? 4-68 raid ezassist user’s manual figure 4-66. Physical drive selection screen this screen uses the following navigation strategy: • arrow keys move among the available physical devices. • enter selects the highlighted physical device. ☞ use the a...

  • Page 221

    Monitoring and maintenance activities manual no. 775029 4-69 figure 4-67. Physical drive menu - advanced options ☞ use the arrow key to select advanced options, then press enter. The physical drive advanced options menu is displayed (figure 4-68). Figure 4-68. Physical drive advanced options menu - ...

  • Page 222

    How do i rebuild redundancy data on a physical drive? 4-70 raid ezassist user’s manual ❑ rebuild redundancy data on the physical drive. ☞ press enter with rebuild redundancy data selected. The rebuild redundancy data warning screen is displayed (figure 4-69): figure 4-69. Rebuild redundancy data? Re...

  • Page 223

    Monitoring and maintenance activities manual no. 775029 4-71 how do i format a physical drive? Raid ezassist gives you the option of low-level formatting physical devices. This may be necessary if you obtain new drives that have not been formatted previously, or if you wish to reuse an older drive a...

  • Page 224

    How do i format a physical drive? 4-72 raid ezassist user’s manual figure 4-71. Physical drive selection screen this screen uses the following navigation strategy: • arrow keys move among the available physical devices. • enter selects the highlighted physical device. ☞ use the arrow keys to select ...

  • Page 225

    Monitoring and maintenance activities manual no. 775029 4-73 figure 4-72. Physical drive menu - advanced options ☞ use the arrow key to select advanced options, then press enter. The physical drive advanced options menu is displayed (figure 4-73). Figure 4-73. Physical drive advanced options menu - ...

  • Page 226

    How do i format a physical drive? 4-74 raid ezassist user’s manual ❑ format the physical drive. , warning there is no additional confirmation for formatting. Once you select the format drive option and press enter, formatting begins immediately on the selected physical drive! ☞ use the arrow key to ...

  • Page 227

    Monitoring and maintenance activities manual no. 775029 4-75 how do i change physical drive status? Certain status changes in physical devices are allowed in raid ezassist. See table 4-1 below: table 4-1. Allowable physical drive status changes , warning be careful about changing online status to of...

  • Page 228

    How do i change physical drive status? 4-76 raid ezassist user’s manual ☞ ☞ ☞ ☞ use the arrow key to select perform administration on... On the main menu, then press enter. The administration menu is displayed (figure 4-75). Figure 4-75. Administration menu - physical device ☞ use the arrow key to s...

  • Page 229

    Monitoring and maintenance activities manual no. 775029 4-77 figure 4-76. Physical drive selection screen this screen uses the following navigation strategy: • arrow keys move among the available physical devices. • enter selects the highlighted physical device. ☞ option 1: if you want to assign a s...

  • Page 230

    How do i change physical drive status? 4-78 raid ezassist user’s manual ❑ enter the physical drive advanced options menu. The physical drive menu is displayed (figure 4-77). Figure 4-77. Physical drive menu - advanced options ☞ use the arrow key to select advanced options, then press enter. The phys...

  • Page 231

    Monitoring and maintenance activities manual no. 775029 4-79 the name of the third option on the physical drive advanced options menu depends on the current status of the physical drive you selected. Table 4-2. Change status advanced option ☞ if you selected an unconfigured drive, use the arrow key ...

  • Page 232

    How do i change physical drive status? 4-80 raid ezassist user’s manual figure 4-79. Example of status change warning/notice ☞ press enter with yes selected to accept the physical drive status change you’ve requested. Setting an unconfigured drive to spare or a spare drive back to unconfigured (unus...

  • Page 233

    Monitoring and maintenance activities manual no. 775029 4-81 how do i rescan a controller for new devices? Here are some situations in which you might add physical devices to or remove physical devices from your hardware setup: • you’ve purchased additional disk drives and wish to add them to one or...

  • Page 234

    How do i rescan a controller for new devices? 4-82 raid ezassist user’s manual figure 4-80. Rescan for new devices ☞ use the arrow key to select rescan for new devices, then press enter. Raid ezassist will rescan the selected controller (figure 4-81). Figure 4-81. Rescanning in progress.

  • Page 235: Chapter 5

    Manual no. 775029 5-1 chapter 5 advanced options in this chapter you’ll learn how to use raid ezassist advanced options for some advanced-level tasks that you may be required to perform from time to time. M caution some advanced options can have sweeping effects on configuration and controller perfo...

  • Page 236

    5-2 raid ezassist user’s manual all functions described in this chapter are carried out using the advanced options choice on the main menu (figure 5-1). Figure 5-1. Advanced options ☞ use the arrow key to select advanced options on the main menu, then press enter. The advanced options menu is displa...

  • Page 237

    Advanced options manual no. 775029 5-3 how do i update controller firmware or the raid ezassist utility? From time to time mylex makes available updated firmware or bios code with new features or fixes for your controller. Raid ezassist offers a straightforward way to update (“flash”) the new code t...

  • Page 238

    How do i update controller firmware or the raid ezassist utility? 5-4 raid ezassist user’s manual figure 5-3. Update flash code ☞ type the name of the image file (and drive letter if necessary), and press the tab key. ☞ insert the diskette into the floppy diskette drive and press enter with ok selec...

  • Page 239

    Advanced options manual no. 775029 5-5 figure 5-4. Flash code update ❑ choose controllers to update. The image file is read from the diskette, then the contents of the image file are displayed in the gray field at the top of the screen. This screen uses the following navigation strategy: • pgdn and ...

  • Page 240

    How do i update controller firmware or the raid ezassist utility? 5-6 raid ezassist user’s manual ❑ update the selected controller(s). ☞ after you’ve selected all controllers to update, press the tab key to select ok, then press enter. The flash code update warning is displayed (figure 5-5). Figure ...

  • Page 241

    Advanced options manual no. 775029 5-7 figure 5-6. Flash process status raid ezassist loads the image file information to the controller and stores it. You will still need to allow the controller to be programmed. ☞ wait for the flash image storage to conclude. A flash code update notice is displaye...

  • Page 242

    How do i update controller firmware or the raid ezassist utility? 5-8 raid ezassist user’s manual figure 5-7. Flash code update notice ☞ if you want to flash additional image files to the controller, press enter with no selected and return to the “choose an image file for the update” step, or ☞ to p...

  • Page 243

    Advanced options manual no. 775029 5-9 how do i back up my configuration? If you want to create a file that maintains the specifications of your current configuration, you can use the backup configuration option to do so. The configuration information can be saved to a floppy diskette so that it can...

  • Page 244

    How do i back up my configuration? 5-10 raid ezassist user’s manual ❑ back up the configuration to a file. ☞ type a name of your own choosing to identify a file in which the configuration will be saved, type a drive letter if necessary, and press the tab key. ☞ insert the diskette into the floppy di...

  • Page 245

    Advanced options manual no. 775029 5-11 how do i restore a previously-saved configuration to a controller? If you want to restore a configuration saved earlier, you can use the restore configuration option to do so. The configuration information will be read from the floppy diskette on which it was ...

  • Page 246

    How do i restore a previously-saved configuration to a controller? 5-12 raid ezassist user’s manual figure 5-9. Restore configuration ❑ restore the configuration to the controller. ☞ type the name of the file which contains the configuration, type a drive letter if necessary, and press the tab key. ...

  • Page 247

    Advanced options manual no. 775029 5-13 how do i print my configuration in readable form? If you want to create a file that maintains the specifications of your current configuration in a readable form, you can use the print configuration option to do so. The configuration information can be saved t...

  • Page 248

    How do i print my configuration in readable form? 5-14 raid ezassist user’s manual ❑ print the configuration to a file. ☞ type a name of your own choosing to identify a file in which the configuration will be saved in readable format, type a drive letter if necessary, and press the tab key. ☞ insert...

  • Page 249

    Advanced options manual no. 775029 5-15 how do i clear (erase) my current configuration? Raid ezassist allows you to clear the current configuration. Clearing the configuration will result in loss of any data that is already on the drives. All disk array drive assignments are deleted, and all drives...

  • Page 250

    How do i clear (erase) my current configuration? 5-16 raid ezassist user’s manual figure 5-11. Clear configuration warning ❑ clear the configuration. ☞ to clear the existing configuration from this controller, use the arrow key to select yes, then press enter, or ☞ to cancel your request to clear th...

  • Page 251

    Advanced options manual no. 775029 5-17 how do i enable (or disable) pci controller clustering? Under windows nt 4.0, clustering allows redundancy among controllers. If a controller fails, another controller can take over the disk drives and disk arrays that were formerly handled by the failed contr...

  • Page 252

    How do i enable (or disable) pci controller clustering? 5-18 raid ezassist user’s manual ☞ if you want to enable clustering, use the arrow key to select yes, then press enter, or ☞ if you don’t want to enable clustering, press enter with no selected. However, if clustering is currently enabled when ...

  • Page 253

    Advanced options manual no. 775029 5-19 how do i reassign a host id for pci controller clustering? If you want to reassign a controller’s host id to another id for use with clustering (controllers are normally set at id 7 by default) , use the hostid change option on the advanced options menu. This ...

  • Page 254

    How do i reassign a host id for pci controller clustering? 5-20 raid ezassist user’s manual figure 5-14. Hostid change this screen uses the following navigation strategy: • in the hostid field, the spacebar brings up a list of valid options. Arrow keys move among the options and enter selects an opt...

  • Page 255

    Advanced options manual no. 775029 5-21 ☞ press spacebar to display a box of available choices, use the arrow key to select your desired id setting, then press enter. ☞ once you’ve selected the alternate id setting, press tab, then press enter with ok selected. ☞ if you need to reassign host ids for...

  • Page 256

    How do i reassign a host id for pci controller clustering? 5-22 raid ezassist user’s manual.

  • Page 257: Glossary

    Manual no. 775029 g-1 glossary acceleraid™ the acceleraid family features high performance, cost effective ultra scsi/ultra2 scsi lvd to pci raid controllers and adapters for high-end desktops, workstations, and entry level and mid range servers. Acceleraid controllers support pci-based motherboards...

  • Page 258

    G-2 raid ezassist user’s manual asynchronous data transfer data transfer not synchronized to a set timing interval. Asynchronous devices must wait for a signal from the receiving device after each byte. Autoswap the functional substitution of a replacement unit in a disk system for a defective one, ...

  • Page 259

    Glossary manual no. 775029 g-3 motherboard so that the bios will always be available and not be affected by failure of a disk. Sometimes the bios is recorded on a flash memory chip. Bios configuration utility bios-based configuration utility; utility program sequences that are used, upon powerup, fo...

  • Page 260

    G-4 raid ezassist user’s manual cache flush refers to an operation where all unwritten blocks in a write-back cache are written to the target disk. This operation is necessary before powering down the system. Cache line size the cache line size is defined as the size, in kilobytes (1024 bytes) of a ...

  • Page 261

    Glossary manual no. 775029 g-5 clustering the concept of grouping controllers or servers so that they may be able to back each other up if one controller or server fails, taking over disk arrays assigned previously to the failed controller or server. Cmos complementary metal oxide semiconductor, a c...

  • Page 262

    G-6 raid ezassist user’s manual logical drive is considered “critical” because any failure of another of its scsi drives may result in a loss of data. Note: i/o operation can only be performed with system drives that are online or critical. Dac960 series a family of raid controllers from mylex corpo...

  • Page 263

    Glossary manual no. 775029 g-7 disk a non-volatile, randomly addressable, re-writable data storage device, including rotating magnetic and optical disks as well as solid-state disks or other electronic storage elements. Disk array a collection of disks from one or more accessible disk systems combin...

  • Page 264

    G-8 raid ezassist user’s manual problem has been resolved, no error is reported to the system. When a disk reports a media error during a write, the controller issues a “reassign” command to the disk, and writes the data out to a new location on the disk. Disk system a storage system capable of supp...

  • Page 265

    Glossary manual no. 775029 g-9 edo extended data output, a type of random access memory (ram) chip designed to improve the time to read from memory on faster microprocessors such as the intel pentium. Eeprom electrically erasable prom eisa extended industry standard architecture. A bus standard for ...

  • Page 266

    G-10 raid ezassist user’s manual extremeraid the extremeraid controller is the newest member of the mylex pci raid family of products. The extremeraid offers uncompromising fault tolerance, data availability, superior configuration and management flexibility. The extremeraid incorporates the latest ...

  • Page 267

    Glossary manual no. 775029 g-11 fault tolerance (failure tolerance) the ability of a system to continue to perform its function even when one of its components has failed. For a system to be fault tolerant requires redundancy in disk drives, power supplies, adapters, controllers and cabling. Mylex r...

  • Page 268

    G-12 raid ezassist user’s manual gigabit 1,000,000,000 (10 9 ) bits gigabyte 1, 000,000,000 (10 9 ) bytes graphical user interface a software interface that interacts with the user through color graphics and a mouse. Gui see graphical user interface hard disk drive the main data storage unit of a co...

  • Page 269

    Glossary manual no. 775029 g-13 host i/o bus an i/o bus used to connect a host computer to storage systems or storage devices hot plug the operation of adding or removing a device from a bus while transactions involving other devices are occurring over the bus. Hot replacement of disks (hot swap) th...

  • Page 270

    G-14 raid ezassist user’s manual i/o input/output, the transmission of information between an external source and the computer. I/o bottleneck any resource in the i/o path whose performance limits the performance of a storage or i/o system i/o bus any path used for the transfer of data and control i...

  • Page 271

    Glossary manual no. 775029 g-15 internet a worldwide system of computer, originally conceived by the u.S. Government to construct a network that would continue to function even if a large portion of it were destroyed, for example, in the event of war. The internet is now a public, cooperative, and s...

  • Page 272

    G-16 raid ezassist user’s manual lan local area network,a network of interconnected workstations sharing the resources of a single processor or server, typically within the area of a small office building. Latency 1. The time between the making of an i/o request and completion of the request’s execu...

  • Page 273

    Glossary manual no. 775029 g-17 megabit a million bits, used as a common unit of measure relative to time in seconds as an expression of a transmission technology's bandwidth or information flow capacity. Megabits per second (mbps) is a frequent measure of bandwidth on a transmission medium. Megabyt...

  • Page 274

    G-18 raid ezassist user’s manual nfs network file system, a client/server application that lets a computer user view and optionally store and update files on a remote computer as though they were on the user's own computer. Nos network operating system nvram non-volatile random access memory, a memo...

  • Page 275

    Glossary manual no. 775029 g-19 partitioning the presentation of the full usable storage capacity of a disk or array of disks to an operating environment in the form of several virtual disks whose aggregate capacity approximates that of the underlying disk or array. Pcb printed circuit board pci per...

  • Page 276

    G-20 raid ezassist user’s manual prom read-only memory that can, with provided instructions, be reprogrammed by a user. Protocol the special set of rules for communicating that the end points in a telecommunication connection use when they send signals back and forth. Queue a line of things, command...

  • Page 277

    Glossary manual no. 775029 g-21 raid controller see raid adapter raid levels mylex disk array controllers support four raid advisory board-approved (raid 0, raid 1, raid 3, raid 5) and two special raid levels (raid 0+1, and jbod). Level 0 block “striping” across multiple drives is provided, yielding...

  • Page 278

    G-22 raid ezassist user’s manual level 10 combines raid 0 striping and raid 1 mirroring spanned across multiple drive groups (super drive group). This level provides redundancy through mirroring. Level 30 data is “striped” across multiple drive groups (super drive group). Maintains parity informatio...

  • Page 279

    Glossary manual no. 775029 g-23 recovery the process of reconstructing data from a failed disk using data from other drives. Redundancy the inclusion of extra components of a given type in a system (beyond those required by the system to carry our its functions.) replacement table a replacement tabl...

  • Page 280

    G-24 raid ezassist user’s manual rotated xor redundancy this term (also known as “parity”) refers to a method of providing complete data redundancy while requiring only a fraction of the storage capacity of mirroring. In a system configured under raid 3 or raid 5 (which require at least three scsi d...

  • Page 281

    Glossary manual no. 775029 g-25 enclosures, making it easier for a lan administrator to obtain base-level fault-tolerant alert notification and status information. All mylex raid controllers feature saf-te. Sca – single connector attachment a 80 pin disk drive/enclosure backplane connector standard ...

  • Page 282

    G-26 raid ezassist user’s manual ready: a scsi disk drive is in a “ready” state if it is powered on and is available to be configured during the current session but remains unconfigured. Online: a scsi disk drive is in an “online” state if is powered on, has been defined as a member of a drive group...

  • Page 283

    Glossary manual no. 775029 g-27 sequential i/o a type of read and write operation where entire blocks of data are accessed one after another in sequence, as opposed to randomly. Server a computer program that provides services to other computer programs in the same or other computers. The computer t...

  • Page 284

    G-28 raid ezassist user’s manual update files on the remote server. It can also communicate with any server program that is set up to receive an smb client request. Snmp simple network management protocol, the protocol governing network management and the monitoring of network devices and their func...

  • Page 285

    Glossary manual no. 775029 g-29 stripe width the number of striped scsi drives within a drive group. Striping refers to the storing of a sequential block of incoming data across multiple scsi drives in a group. For example, if there are 3 scsi drives in a group, the data will be separated into block...

  • Page 286

    G-30 raid ezassist user’s manual tcp-ip transmission control protocol/internet protocol, the basic communication language or protocol of the internet. It can also be used as a communications protocol in intranets and in extranets. When set up with direct access to the internet, a computer is provide...

  • Page 287

    Glossary manual no. 775029 g-31 ultra scsi (fast 20 scsi) a high performance scsi protocol that has a bus speed of 20 megabytes per second in the narrow scsi configuration and 40 mb in the wide scsi (fast 20 wide scsi) configuration. Ultra wide scsi 16-bit wide ultra scsi (is devices), double the sp...

  • Page 288

    G-32 raid ezassist user’s manual cause loss of data. However, a write through cache results in a slightly lower performance. Write-back cache refers to a caching strategy whereby write operations result in a completion signal being sent to the host operating system as soon as the cache (not the disk...

  • Page 290

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