The purpose of a Storage Group is to give you the ability to write to a
specified group of Storage Units.  A Storage Group that contained All
Storage Units would be the same as selecting Any Available in a backup
Policy.

When the Policy runs, you will still see the backup go to one of the
Storage Units in the Storage Unit Group.

An example of where a Storage Group is beneficial is if you have
multiple Media Servers on a single subnet.  You could create a Storage
Group for the xxx Subnet that has Storage Units from Media Server 1 and
Media Server 2 who both have NICs on the xxx Subnet.  When the backup
runs, the data will go to either MS1 or MS2.

Another example would be a Storage Group for a Media Server that has
multiple Robots attached.  Since a Storage Unit can only contain 1
robot, if you have more than one Robot attached to your server you'll
need to create multiple Storage Units.  Example - let's say you've got 3
LTO-2 tape drives in Robot 1 on SAN Fabric A and 3 LTO-2 tape drives in
Robot 2 on SAN Fabric B.  If you want all of those Storage Units to be
available for a backup Policy, you should create a Storage Group with
both Storage Units in it.

Russell

-----Original Message-----

Message: 8
From: <bobbyrjw AT bellsouth DOT net>
To: <veritas-bu AT mailman.eng.auburn DOT edu>
Date: Wed, 27 Jul 2005 12:16:01 -0400
Subject: [Veritas-bu] How do Storage groups need to be set up?

In trying to configure and use a storage group, it seems that the
backups continue to go to the individual storage units.

Master is Solaris 8, NB 4.5FP8.  Media servers are 1 Sun, 1 Win2k.  ADIC
10K library with 20 LTO-2 drives.

If you are going to use a storage group set up, do you make sure that no
policies are using "Any Available"?

Do you start to specifically assign the storage groups to each policy?

I really can't find any "good" documentation about correctly configuring
a storage group.  The docs just say to do it, but not what to do with
it.

Thanks.