All this is normal. It is done unintentionally by yourself and the one who
can change it is again you. The explanation:
You did not entered ESTCAP parameter defining device class and TSM assumed
3590E-C. According to TSM help and docs it is 20GB. Use UPD DEV 3590DEV
ESTCAP=40G (or ESTCAP=80G). You can set it to whatever you like but this
may look sometimes strange.
Look at the example (same data on both volumes):
tsm: PUMBA.ACIT.BG>q dev 8mm
Device Device Storage Device Format Est/Max Mount
Class Access Pool Type Capacity Limit
Name Strategy Count (MB)
--------- ---------- ------- --------- ------ --------
------
8MM Sequential 2 8MM 8500C 10,240.0
DRIVES
tsm: PUMBA.ACIT.BG>q vol
Volume Name Storage Device Estimated Pct Volume
Pool Name Class Name Capacity Util Status
(MB)
------------------------ ----------- ---------- --------- -----
--------
DAT000 8MMPOOL 8MM 10,240.0 0.2 Filling
tsm: PUMBA.ACIT.BG>upd dev 8mm estcap=10M
ANR2205I Device class 8MM updated.
tsm: PUMBA.ACIT.BG>q dev 8mm
Device Device Storage Device Format Est/Max Mount
Class Access Pool Type Capacity Limit
Name Strategy Count (MB)
--------- ---------- ------- --------- ------ --------
------
8MM Sequential 2 8MM 8500C 10.0
DRIVES
tsm: PUMBA.ACIT.BG>q vol
Volume Name Storage Device Estimated Pct Volume
Pool Name Class Name Capacity Util Status
(MB)
------------------------ ----------- ---------- --------- -----
--------
DAT001 8MMPOOL 8MM 16.4 100.0 Filling
All this is because until tape end is reached all this is an estimate. If
tape in a devclass with estcap=100G fills up to say 77GB it would jump "Pct
Util" from 76.9% to 100%. Same data on a tape in a devclass with estcap=50G
will reach 100% at 50GB and will stay "Pct Util"=100% and "Volume
Status"=Filling until tape end is reached (at 77GB). After that point when
versions expire they create "data holes" on the volume and "Pct Util"
slowly drops down (what in fact happened to your volumes C00031, C00035,
C00057, C00061). When it reaches utilization (100% - REClaim) reclamation
takes place.
Zlatko Krastev
IT Consultant
Michael Bartl <[EMAIL PROTECTED]> on 28.09.2001 16:40:19
Please respond to [EMAIL PROTECTED]
To: [EMAIL PROTECTED]
cc:
Subject: Size of tapes in TSM
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
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 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:[EMAIL PROTECTED]
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
