Quantum DLT 7 Install Manual

DLT™1/7 TAPE UNIT INSTALLATION 

Digital Unix 4.0;

IBM RISC System/6000 must have the appropriate SCSI interface for DLT drive to attached to, i.e., a SCSI 

single-ended DLT drive can be attached only to a SCSI single -ended interface. The same is true for SCSI 

differential attachment. After the DLT tape peripheral has been attached, you will need to perform certain 

system operations that allow the DLT tape peripheral to be recognized. 

Adding device definitions   

Adding device definitions 

Digital UNIX version 4.0 uses Dynamic Device Recognition to simplify adding support for 

a new SCSI device. Adding a new device is a three-step process:  

1.  Use the ed, vi, or jot editor to add or modify a tape drive definition in the 

/etc/ddr.dbase file. This file contains sectio ns for each device definition. Adding a 

new device definition is usually as easy as copying and pasting information from a 

similar device and making one or two modifications.  

2.  Make the new definition(s) known to the system by issuing the command 

ddr_config 

c /etc/ddr.dbase

.  

3.  (optional) Generate the device files by running 

/dev/MAKEDEV

 for the added device.  

When these steps are complete, your system is ready to use the new tape drive. You do not 

need to reboot. If the new tape drive does not operate as you expect, you can repeat the 

above steps to modify the definition until the device operates correctly.  

Procedure for modifying the device definitions 

Note: The device definitions in this document are for Digital UNIX version 

4.0a. Later versions may contain slightly different default entries in the 

/etc/ddr.dbase file. 

Follow these steps to add a new tape drive to the /etc/ddr.dbase file:  

Important: Always create a backup copy of the file before you modify it. 

4.  Login with root privileges.  

5.  Go to the /etc directory:  

6. 

cd /etc 

7.  Make a backup copy of the original ddr.dbase file:  

8. 

cp /etc/ddr.dbase /etc/ddr.dbase.orig 

9.  Edit the ddr.dbase file to add the new tape drive. See the following sections for the 

required modifications for each type of Exabyte tape drive.