Andy,
John D. and Mario raised good points. As for our VTL environment, we
have a blend of IBM TS7520/7510 (3955 & 3954 Machine Types). We make use
of "expandable" virtual volumes with an initial size of 5G and a max
size of 60G and it works well in my opinion.
With Compression enabled, we get more out of each VTL volume without
exposing ourselves to extremely long migrations, backups of the storage
pools and other administrative processes.
As a side note, the intersection between TSM and the VTL is a bit
tricky, for instance, though we defined VTL volumes with a max size of
60G in the Virtual Engine for Tape Console, we get a different estimated
capacity once the virtual volume are checked in TSM and being written
to. See below for illustration.
Volume Name Storage Device Estimated Pct
Volume
Pool Name Class Name Capacity Util
Status
------------------------ ----------- ---------- --------- -----
--------
X40025 P_USER_VTL VTL2 126.5 G 91.1
Full
X40050 P_USER_VTL VTL2 180.0 G 14.8
Filling
BERTAUT TCHUISE
Storage Support Administrator
Legg Mason Technology Services
*410-580-7032
btchu...@leggmason.com
-----Original Message-----
From: ADSM: Dist Stor Manager [mailto:ads...@vm.marist.edu] On Behalf Of
Huebner,Andy,FORT WORTH,IT
Sent: Tuesday, July 07, 2009 10:36 AM
To: ADSM-L@VM.MARIST.EDU
Subject: [ADSM-L] VTL Tape Size
We are about to bring up new TSM servers and one of questions that has
come up is how big to make the VTL tapes? We currently use 100GG and
have tried 10GB with our test server.
The question is what size it popular and why?
Andy Huebner
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