ADSM-L

Size of tapes in TSM

2001-09-28 09:43:06
Subject: Size of tapes in TSM
From: Michael Bartl <michael.bartl AT CW DOT COM>
Date: Fri, 28 Sep 2001 15:40:19 +0200
Hi Tape Gurus,
on our TSM servers we use a 3494 tape library with Magstart 3590 E1A
drives.
These drives should support a tape size of 20 GB (+compression) on "blue
tapes"
and 40 GB (+compression) on "green tapes". The tapes in our library are
green...

Now in TSM when I do a "q vol" I get results like
          Storage        Device         Estimated       Pct      Volume
          Pool Name      Class Name      Capacity      Util      Status
------    ----------     ----------     ---------     -----     --------
C00011    BACKUPTAPE     3590DEV         20,000.0       0.2     Filling
C00011    BACKUPTAPE     3590DEV         20,000.0       0.2     Filling
C00021    BACKUPTAPE     3590DEV         20,000.0      48.7     Filling
C00031    BACKUPTAPE     3590DEV         49,338.6      59.0       Full
C00035    BACKUPTAPE     3590DEV         43,812.0      73.8       Full
C00057    BACKUPTAPE     3590DEV         54,338.6      75.8       Full
C00061    BACKUPTAPE     3590DEV         52,209.3      84.4       Full

and "q dev 3590DEV"
Device        Device         Storage     Device        Format
Est/Max      Mount
Class         Access            Pool     Type
Capacity      Limit
Name          Strategy         Count
(MB)
---------     ----------     -------     ---------     ------
--------     ------
--------     ------
3590DEV       Sequential           2     3590
3590DEV       Sequential           2     3590
DRIVE                        2

We usually don't use client compression, so I'd expect about 60 to 80 GB
to fit onto the tapes.
Does anybody have an idea why TSM (4.1.4.0 on Solaris) estimates just 20
GB for the 40 GB tapes?

Thanks for any hints,
best regards,
Michael
--
Michael Bartl                               mailto:michael.bartl AT cw DOT com
Michael Bartl                               mailto:michael.bartl AT cw DOT com
System Administrator Backup                 Tel: +49-89-92699-806
Office of Technology, IT Germany/Austria    Fax: +49-89-92699-302
Cable & Wireless Deutschland GmbH., Munich  http://www.cw.com/de
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