ADSM-L

Use of TSM disk storage pools volumes by clients

2002-03-06 10:55:31
Subject: Use of TSM disk storage pools volumes by clients
From: John Schneider <jdschn AT ATTGLOBAL DOT NET>
Date: Wed, 6 Mar 2002 09:53:03 -0600
Greetings,
    Sorry if this is a newbie question, but I have not been able to find
the answer in the manuals.
    Say a TSM server has a disk storage pool with 5 volumes.  When a
given client is backing up to a disk storage pool, will all his backup
data go to the same disk storage pool volume?  Or will it go to one
volume only until that volume fills up, then go on to another volume?
    And what if there are 10 clients backing up to 5 volumes?  Do 5
clients get exclusive access to the 5 available volumes (like they would
to tape) while the other 5 wait, or do they all get to write to the
volumes?
    Another question that depends on the answers to that question is, if
you have a big disk, say a 73GB disk you intend to use for disk storage
pool, is it better to make it one big disk storage pool volume, or make
it more small storage pool volumes, like 7 volumes of 10GB each?  If
each client got a different disk storage pool volume, then you would
think this would perform very slowly, since you would have to seek all
over the disk as those 7 clients each wrote to separate volumes on the
same physical disk.  On the other hand, if you made it one 73GB volume,
it might perform very slowly if only one client could write to it, and
the others had to wait.

Please reply via email if you have any insight into these questions, and
I will post a summary to the list.

Thanks in advance,

John Schneider
Lowery Systems, Inc.
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