One option is to set the storage units on the SAN media servers to "on
demand only", however you'd have to specify the storage unit for the
media server backups.  I assume you don't want to do this, since you
see two libraries from each and want to retain that redundancy.

What you'll probably need to do until you get to 4.5 is to set up
separate pools, say Backups, SANMS1 and SANMS2.  Now you can point all
the classes to "any available", but it won't select the "wrong"
storage units because you'll specify the appropriate pools in the
classes. 

In 4.5, you can create storage unit groups, so for example one SAN
media server backs up to a group which contains the two storage units
specifying drives local to it.

Darry Cooley writes:
> Our backup environment (completely HP-UX) consists of a master server
> and 2 SAN media servers.  The 3 servers see 2 LTO libraries, each
> library contains 6 drives.  Maximum Jobs per Client is set to 8.
> 
> SAN media server 1 - is configured so that it sees only 2 LTO drives
> from each library (4 total), mpx disabled on storage unit, set to 2 in
> the schedule, backs up itself.
> SAN media server 2 - configured the same
> master server - class is configured to use any available storage unit,
> bp.conf says MUST_USE_LOCAL_DRIVE, the storage units for the master
> server are set to see 2 drives/storage unit, mpx set to 6 for the
> storage unit & schedule, backs up 12 clients via LAN.
> 
> The idea was that the 2 SAN media servers would grab 4 drives each and
> do their backups.  The master server would perform traditional LAN
> backups using 4 drives.  The SAN media servers are performing fine,
> however, a number of my clients that backup to the master server try to
> use the drives from the SAN media servers and I'm constantly seeing the
> following error on those clients:
> 
> 59 - Access to the client not allowed, where a client tried to use one
> of the drives on the SAN media server.
> 
> How can I configure NetBackup such that the LAN clients do not attempt
> writes to the SAN media servers?
> 
> Thanks...
> 
> ...Darry
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-- 
Larry Kingery 
               "What are you going to do, bleed on me?"