Hi Kern,
Now it´s very clear for me :-)
Thank you a lot!
Best regards,
Ana
On Tue, Nov 25, 2014 at 4:21 PM, Kern Sibbald <k...@sibbald.com> wrote:
> Hello Ana,
>
> Nice to hear from you :-)
>
> On 11/25/2014 05:43 PM, Ana Emília M. Arruda wrote:
>
> Hello Kern,
>
> Is there any problem to set Maximum Concurrent Jobs = 1 in Devices
> definition?
>
>
> No, but if you have multiple disk devices that point to the same
> directory, you will get a certain amount of disk fragmentation, whereas if
> you allow Maximum Concurrent Jobs to be a bit higher (say 5), you will get
> interleaving of jobs but not disk fragmentation (it probably works out to
> be roughly the same performance wise).
>
> So, it is only a question of efficiency.
>
> For tapes, see below ...
>
>
> Setting this directive to a higher value and, in the case of using tape
> libraries, combined with data spooling for reducing data interleave, should
> make our backups goes faster. But if someone really don´t need that more
> than one job writes to one tape and want to have no data interleave, is
> this configuration a problem?
>
>
> For tapes, Bacula will definitely run faster if you do data spooling, and
> as you note it will reduce interleaving too. For best performance try to
> have the fastest disks possible, perhaps with some form of RAID (for speed)
> if you are writing to an LTO-5 or LTO-6 drive.
>
> If someone does not need more than one job writing to a tape and wants no
> data interleaving, then setting Maximum Concurrent Jobs = 1 is the best
> solution.
>
> Best regards,
> Kern
>
>
>
> On Tue, Nov 25, 2014 at 10:42 AM, Kern Sibbald <k...@sibbald.com> wrote:
>
>> Hello,
>>
>> This is a mini-status report just to let you know that someone on one of
>> these lists said that the new white papers advise using:
>>
>> Maximum Concurrent Jobs = 1
>>
>> In the bacula-sd.conf Device resource. I have reviewed the three white
>> papers listed on the bacula.org site and I find no such mention. Almost
>> all the examples use MaximumConcurrentJobs=5 and several set it to 10.
>>
>> If someone can point me to the place (if it exists) where 1 in
>> mentioned, I will be happy to fix it.
>>
>> In addition, another person pointed out that manual_prune.pl does not
>> seem to be available. That was an oversight on my part, and that file is
>> now included as a download item under White Papers. The essential
>> elements of what manual_prune.pl does has been integrated directly into
>> the Bacula source code, and in the next few days I will update the
>> documentation to refer to the new way of doing "manual" pruning (i.e.
>> pruning once a day rather than at the end of every Job).
>>
>> For those of you who are not aware of the pruning issues, you need to
>> know that when one has many jobs (say 1000 per day) and many Volumes,
>> the normal Job pruning that Bacula does at the end of each Job can
>> become a performance problem (not likely with less than 50 jobs per
>> day). To resolve it, it is best to turn off automatic pruning but then
>> to schedule an Admin job once a day that will do the equivalent. The
>> program (now integrated into the code) manual_prune.pl was written by
>> Bacula Systems for the Enterprise customers, but is published for your
>> use with the community version.
>>
>> Finally, I have made a few very minor changes to the Best Practices for
>> Disk Based Backup document.
>>
>> Best regards,
>> Kern
>>
>>
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>
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