DLT VS80 Tape Drive Reference Guide

Operating System Device Drivers
41DLT VS80 Tape Drive Reference Guide
Turning Compression On or Off
The following sections give two examples of turning compression on or off using
the tar command.
Example 1 - Turning Compression On
An example to turn on compression using a tar command is:
$tar cvf /dev/tape/tape5_d? filename.txt
Where:
■ tape5 = the tape device as known by the system (shown in the file command,
in this case, tape unit 5).
■ ? = 1, 3, 5 or 7 will turn hardware compression on.
Example 2 - Turning Compression Off
The following command turns hardware compression off:
$tar cvf /dev/tape/tape5 filename.txt
Where:
■ tape5 = the tape device as known by the system (shown in the file command,
in this case, tape unit 5).
■ ? = 0, 2, 4 or 6 will turn hardware compression off (see the DLT VS80 drive
description in the ddr.dbase file online).
DDR tables are part of the UNIX patches. For the latest UNIX patches refer to:
http://welcome.hp.com/cou n try/us/ eng/s oftware_driv ers.htm.