Are you talking about multiplexing or multi-streaming?

Multiplexing specifically allows multiple jobs to use one tape.

If you want each job to use its own tape, set multiplexing to 1.

Paul

> -----Original Message-----
> From: veritas-bu-admin AT mailman.eng.auburn DOT edu 
> [mailto:veritas-bu-admin AT mailman.eng.auburn DOT edu] On Behalf Of 
> Larsen, Errin M HMMA/IT
> Sent: May 3, 2005 9:54 AM
> To: veritas-bu AT mailman.eng.auburn DOT edu
> Subject: RE: [Veritas-bu] Scratch Pool Usage
> 
> 
> 
> Hi again, everyone.
> 
> I'm constantly faced with the below situations.  When one of my volume
> pools runs low on tapes (lower than the multiplexing value), then
> backups take too long to run.  I want NetBackup to grab 
> enough tapes out
> of the scratch pool to max out the backups using the value in the
> multiplexing setting.  Is this impossible?  If so, is the Scratch pool
> useless with a multiplexing value greater than 1?
> 
> --Errin
> 
> 
> > -----Original Message-----
> > From: veritas-bu-admin AT mailman.eng.auburn DOT edu 
> > [mailto:veritas-bu-admin AT mailman.eng.auburn DOT edu] On Behalf Of 
> > Larsen, Errin M HMMA/IT
> > Sent: Monday, May 02, 2005 1:20 PM
> > To: veritas-bu AT mailman.eng.auburn DOT edu
> > Subject: [Veritas-bu] Scratch Pool Usage
> > 
> > 
> > Hi NetBackupers,
> > 
> >   I want to know how NetBackup decides when and how to use 
> > the Scratch pool.  Here is an example.  If I have a Policy, 
> > let's say policy_foo, and it uses the volume pool, pool_foo, 
> > and pool_foo has zero tapes in the library, will NetBackup 
> > pull one tape from the scratch pool to fill it's needs, or 
> > more than one?  I'm having a hard time describing my problem here.  
> > 
> >   Let's look at It the other way around.  If pool_foo has 10 
> > tapes, and policy_foo is configured with a value of 4 for 
> > media multiplexing, when the job kicks off, NetBackup will 
> > (attempt to) mount 4 tapes, pulled from pool_foo, and write 
> > to all of them at the same time.  If pool_foo has only 1 tape 
> > in it, NetBackup will pull just that 1 tape (and therefore, 
> > the backup takes a lot longer to run!).  If pool_foo has 0 
> > tapes, will netbackup grab just 1 tape from Scratch to write 
> > to, or is it smart enough to grab 4 (so as to maximize the 
> > multiplexing)?  Also, If there is only 1 tape in pool_foo, 
> > why doesn't NetBackup grab 3 tapes from Scratch to max out 
> > the multiplexing?
> > 
> >   I hope those questions make some sense.  Thanks in advance 
> > for your answers,
> > 
> > --Errin Larsen
> > 
> > _______________________________________________
> > Veritas-bu maillist  -  Veritas-bu AT mailman.eng.auburn DOT edu 
> > http://mailman.eng.auburn.edu/mailman/listinfo/veritas-bu
> > 
> 
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