This is because you have two media servers, and all the media in Netbackup
is "assigned" to a particular media server while they have valid data on
it.  A tape will be deassigned once it's expired and it'll be up for the
grab again.

Personally, I think the whole concept of assignment is a very stupid idea.
I raised this issue to Veritas a few times and hopefully they'll get rid of
this in version 4 (more likely in version 5).

--Mike

> From veritas-bu-admin AT mailman.eng.auburn DOT edu  Wed Mar 15 14:53:45 2000
> Re: Connecton of two hosts to a single robot
> 
> I have an ATL P1000 with 4xDLT7000 tape drives installed. I have two UNIX 
> hosts, each connected to two drives. I have created two Storage Units (SU), 
> each containing two drives, associated with each system. I believe this is 
> the usual way of creating a 'split robot' configuration.
> 
> I have observed that a tape, allocated to and written by one SU is not
> available to the other, despite the tape being physically accessable
> to the other SU.
> 
> This has the effect of creating a pool within a pool eg. PoolX has tapes 
> that are accessable to both SUs, if SU_A requires a tape it cannot access 
> and use any tape that has been previously used by SU_B (unless the volume 
> has expired) even if it is a tape from the required pool with space 
> available on it.
> 
> This behaviour has serious implications to my volume allocation strategy (I 
> keep getting error 96 - no media available, despite there being plenty of 
> tapes for the requested pool available within the robot)
> 
> My questions:
> 
>   o Is this behaviour correct?
>   o Is there a way of modifying it so that one SU can gain access to
>     the other's volumes?
> 
> 
> Can any-one help?
> 
> George
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-- 
Mike Wei       Collective Technologies, a Pencom Company
Email: wei AT colltech DOT com