Ray,

Depents of the amount and type of data each node stores in TSM, the number
of tape drives and the tapetechnologie used.

If you backup databases you can dump this data in one storagepool.

THhis keeps admin sched down.. and tapeutillasation up with out
significantly decreasing restore speed.

If you are backing up large filesystems with few drives you want
collocation.

This to minimise tape mounts..

If you are backing up large filesystems with a lot of drives you dont wand
collocation becaus you want as much tapemounts as possible.

Large file system restores from LTO are very slow, large filesystems on
magstar are faster...

Do your self a favour and check restore speeds of largefilesystems after a
couple mounts when reclamation and incrementals have scatterd al file system
data over the tapes......of if collocation works..

Succes,

Koen.

From: Ray Baughman <rbaughman AT NATIONALMACHINERY DOT COM>
Reply-To: "ADSM: Dist Stor Manager" <ADSM-L AT VM.MARIST DOT EDU>
To: ADSM-L AT VM.MARIST DOT EDU
Subject: Collocation Vs Multiple Storage Pools
Date: Fri, 26 Sep 2003 09:44:06 -0400

I've got a storage pool which contains data from 5 Nodes, which has
collocation turn on.  What are the pros and cons of running this way as
opposed to having 5 separate storage pools?  I was thinking management of
the pools, but with only five pools this does not seem an issue.  Also by
having individual pools, I could easily find the tapes associated with a
node.  Any Ideas?

Ray Baughman
TSM & Engineering Systems Administrator
National Machinery LLC
Phone 419-443-2257
Fax 419-443-2376
Email rbaughman AT nationalmachinery DOT com

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