On 2012-08-02 09:32, John Drescher wrote:
> On Thu, Aug 2, 2012 at 9:39 AM, dweimer <dweimer AT dweimer DOT net> wrote:
>> I have been doing some searching, but I am apparently not searching 
>> on
>> the right key words, and can't seem to find out how to enable 
>> multiple
>> jobs to run simultaneously.  I am running my backups to Disk only 
>> and
>> not tape, so I do have random access media, and also knowing that
>> running multiple jobs to the volume may slow down restores.  The 
>> problem
>> that I am trying to solve is a slow link to one of the machines, it
>> takes a several hours to backup, so I need to start it early, but 
>> don't
>> want to make the remaining server have to wait for it to complete 
>> before
>> executing their backups.  Some of the faster machines are fairly 
>> large
>> volume and may take up to an hour so I would rather not just run 
>> them
>> first delaying the slow machines start for a couple of hours.
>>
>> I know there are some Max Concurrent Jobs settings, not sure if I am
>> just missing one of those or if I need to add more storage 
>> devices/pools
>> possibly a spool area, etc.  I have made sure to configure the
>> priorities correctly (since in my searching I have found that it 
>> will
>> only run same priority jobs at same time, which makes sense) so the 
>> main
>> backup jobs are one priority, a few less critical servers another, 
>> and
>> then the catalogue backup set to run last.
>>
>> If anyone knows of some documentation that describes all the steps 
>> is
>> necessary to allow multiple jobs at once, and can direct me to it, 
>> that
>> would be great.
>
> The manual does describe all of the steps necessary although maybe 
> not
> in one single place.
>
> At minimum you need to set "Max Concurrent Jobs" for the director,
> storage and possibly client resource of bacula-dir.conf. Also 
> remember
> that a single storage device (even a disk) can only load 1 volume at 
> a
> time. So that if you have multiple jobs going to different volumes 
> you
> can not use a single storage device. Also you need to have all jobs 
> at
> the same priority if you want to run them concurrently. If jobs are 
> at
> different priorities they will preempt jobs at lower priorities.
>
> John

 From the Tips and tricks section of the problem resolution guide, I 
have set the director, storage, client, and job resources all to use Max 
concurrent Jobs = 4, I have also set the device under the bacula-sd.conf 
to have a Max Concurrent Jobs = 4, as I found that was a new feature in 
the 5.0 branch from the documentation.  The file daemons and storage 
daemon, were already set to 20 max concurrent jobs. I don't believe that 
I need the entries under Job and Client, as I only intend to run one job 
per client and job, but I figured for testing I would start with them in 
there.  The jobs I am testing with are both set to the same priority.  I 
have reloaded the director, and restarted the storage daemon to get the 
new configurations read.
I then fired off 2 jobs, and no luck the second job reports waiting 
execution, and executes as soon as the first job finishes.  Is there any 
way to get a more detailed report of why the job is waiting execution, 
to see if I can find out what I am missing from that.
I know that in the long run it would be better to have separate devices 
and pool definitions, but as it appears to be technically possible 
without doing this, I would at least like to prove it will work before I 
add even more complexity to the configuration, of course if its not 
possible I don't have a choice, but as the volumes are file based on 
disk I know I will take a hit in restore performance by writing 2 jobs 
at a time to the volume, but at this point that’s an acceptable down 
side.  If I was writing to tape, I would think differently about that 
performance hit, as it would be much greater if that were the case.

-- 
Thanks,
    Dean E. Weimer
    http://www.dweimer.net/

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