On 11/2/2011 3:57 PM, Bob Hetzel wrote:
> On 10/29/2011 10:06 AM, S?bastien WENSKE wrote:
>> Hi List !
>>
>> Does someone knows why "sometimes" Bacula marks Volumes in Error when it
>> can't load a Virtual Tape (a file) because it's already use by another
>> Virtual Device in the Virtual AutoChanger ? I specified " Prefer Mounted
>> Volumes = no" in the JobDefs
> The programmers have added a different option for trying to use multiple
> drives in the same pool.  Instead of using "Prefer mounted volumes = no"
> you should "Maximum Concurrent Jobs " per device a try
>
> http://www.bacula.org/5.0.x-manuals/en/main/main/New_Features_in_5_0_0.html#SECTION00510000000000000000
>
> I've been running with this newer config for more than a year now with much
> improved results.  I used to get race conditions that would cause bacula to
> crash using prefer mounted volumes=no and concurrently running 10-15 jobs
> concurrently on two drives.  Also, I believe Kern said that was an
> "unsupported" configuration a while back, but they do intend to fix any
> bugs found in the "Maximum Concurrent Jobs " per device code.

Thanks, Bob. That is a sensible approach, come to think of it. 
Previously, Maximum Concurrent Jobs could only be set for the Storage in 
the Director's config. Placing a concurrent job restriction at the 
Device level in SD is a more practical solution. I was under the 
impression that without Prefer Mounted Volumes = no, Bacula would not 
select more than one tape from the same pool for concurrent jobs writing 
to the same pool. If that is not the case, then it seems to me that 
Prefer Mounted Volumes is likely deprecated.

--- Josh Fisher

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