On Nov 28, 2005, at 6:28 AM, Volker Maibaum wrote:
Hello,
We have a TSM Server 5.3.2.1 on z/Linux with a 3494 Library and 3592
Tape drives.
In the 3592 device class I have used the format=DRIVE option (see
below). How can I find out if the data on the volumes is written with
drive compression?
To augment Stef's response...
I'm not aware of a way to inspect the tapes themselves, but you can
ask the drives what they are doing: In AIX, the 'lsattr -EHl rmt_' or
'mt -f /dev/rmt_ status' commands will show whether TSM has enabled
compression in them, as in response:
attribute value
description user_settable
compress yes Use Hardware Compression on
Tape True
The average capacity of my volumes is 430GB (> native 300GB). Now I'm
not sure if this is due to client compression or due to drive
compression.
I'm getting about the same, with Format 3592C.
...
Richard Sims http://people.bu.edu/rbs
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