The library manager allocates the drives to the server instances that
request mounts. If more mounts are requested than there are available
drives, then the most recent mount requests have to wait until a drive
becomes available. This is a pretty common occurrence in our environment
at certain times of the day. It doesn't hurt anything - it just makes some
processes take a little longer.
There's no need to adjust the number of tape drives available to each
server, unless one server has more critical processing to do and must have
priority to the drives over the other server. If all of the drives are
available to both of the TSM instances, the library manager will honor
mount requests on available drives as the requests come in.
Robben Leaf
From:
Thomas Denier <Thomas.Denier AT JEFFERSONHOSPITAL DOT ORG>
To:
ADSM-L AT VM.MARIST DOT EDU
Date:
12/10/2008 03:19 PM
Subject:
[ADSM-L] Library manager oversubscription
Sent by:
"ADSM: Dist Stor Manager" <ADSM-L AT VM.MARIST DOT EDU>
I support a TSM server running under mainframe Linux. The database
has been growing at varying rates since we installed TSM. We are
starting to think about splitting the workload between two TSM
servers if there is a major growth spurt before we upgrade to 6.1
(we are currently at 5.4.2.0). If we did this we would set up a
third server to act as a library manager for the other two. We
would want to be able to adjust the number of tape drives available
to each server to adjust to variations in the workload. This would
be done by adjusting the mountlimit settings for the tape device
classes. What would happen if we made a mistake in this process
and ended up with the servers collectively requesting more tape
drives than actually exist?
U.S. BANCORP made the following annotations
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