It´s generation 1 drives, and the driver is the latest from IBM (September 
2009).

I check in device manager and the driver version is 6.2.0.1 (3592J1A), and it 
even say in "Tape drive parameters" that Compression capable is TRUE, and 
Compression enabled TRUE.

-----Original Message-----
From: ADSM: Dist Stor Manager [mailto:ADSM-L AT VM.MARIST DOT EDU] On Behalf Of 
Richard Sims
Sent: den 26 oktober 2009 12:28
To: ADSM-L AT VM.MARIST DOT EDU
Subject: Re: [ADSM-L] 3592 drives no compression

You didn't specify whether these were 3592 generation 1 or 2 drives.
If gen 1, the 3592C you have set is the correct devclass specification.

I would check that your tape device driver is the correct type, and is
a recent vintage, to avoid any vagaries in passing device commands
from TSM to the drives.  Defects in drivers are not unknown.  Likewise
for tape drive microcode/firmware.

See if you can find a utility to inspect the drive settings, to verify
what they are.  In AIX, the lsattr command can be used to verify if
compression is in effect; I don't know what might be used in Windows.

    Richard Sims


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