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
> 
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