Are you sure? I just found this in the manual while configuring director:

http://www.bacula.org/en/rel-manual/Configuring_Director.html

---------------------
Maximum Concurrent Jobs = <number>

Please note that the Volume format becomes much more complicated with 
multiple simultaneous jobs, consequently, restores can take much longer if 
Bacula must sort through interleaved volume blocks from multiple 
simultaneous jobs. This can be avoided by having each simultaneously running 
job write to a different volume or by using data spooling, which will first 
spool the data to disk simultaneously, then write each spool file to the 
volume in sequence.
---------------------


Thomas Krwawecz III
--
Blue Gravity Communications, Inc.
3495 Haddonfield Rd, Suite 6
Pennsauken, NJ 08109

Toll Free: 1-877-8 HOSTING
Tel: (856) 662-9100, Fax: (856) 662-9101
Web: http://www.bluegravity.com


----- Original Message ----- 
From: "John Drescher" <drescherjm AT gmail DOT com>
To: "Thomas Krwawecz III" <tom AT bluegravity DOT com>
Cc: <Bacula-users AT lists.sourceforge DOT net>
Sent: Wednesday, April 30, 2008 3:40 PM
Subject: Re: [Bacula-users] Migration from Arkeia, Other Questions


>>  One thing I'm having a hard time understanding. Can jobs run 
>> concurrently
>>  (backup 25 servers at a time) to the same volume?
>
> Yes. You set this with the maximum concurrent jobs setting. Note you
> may need to set this in 5 or more places in your configs depending on
> the level of concurrency you want.
>
>>
>> Or is it suggested that
>>  each job/client backup to its own volume?
>>
> Its better to not do that.
>
>>
> John
> 


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