that is a solution for now since we backup to disk. i did read
http://www.bacula.org/en/rel-manual/Basic_Volume_Management.html and
understood nothing, though. the text is not very well written.

soon we want to switch to our new and expensive tape robot though and
want to backup to tape instead and then concurrency wont work anymore,
will it? at that point we would need to come back to that "ahead of
time" backup anyway, right?



On Sat, Apr 11, 2009 at 11:48 PM, John Drescher <drescherjm AT gmail DOT com> 
wrote:
> On Sat, Apr 11, 2009 at 5:29 PM, Andreas Schuldei
> <schuldei+bacula-users AT spotify DOT com> wrote:
>> hi!
>>
>> Currently our bacula system cycles through our servers and for each it
>> initiates the respective backup shell script, waits for its
>> completion, transfers the data and continues on to the next box.
>>
>> This cycle is rather predictable and repetitiv. On some servers, where
>> time consuming finds and tars are executed the system spends a lot of
>> time waiting on the completion of those, until it can start
>> transferring the resulting tar files.
>>
>> I would like to speed up the process by preparing these backups ahead
>> of time, so that they finish just in time for the bacula director to
>> come by and pick up the new tar files, so that only little or no time
>> would be spend waiting. Ideally i would like it to be adaptive. the
>> longer it takes to prepare the backup the earlier it would start to
>> prepare it. if for some reason the datavolumes shrinks and the
>> preparation would take less time, gradually move the start backwards.
>> Should the preparation of the backup not have started when the bacula
>> director comes by the backup is made the old fashioned way with the
>> director waiting for completion.
>>
>> Has someone build a system like this?
>>
> I would just enable concurrency. Use a small spool file (less than 10
> GB) and let several machines run their backups simultaneously.
>
> John
>

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