On Thu, Aug 9, 2012 at 8:05 AM, Jummo <jummo AT devio DOT us> wrote:
>
>
> On Thu, 9 Aug 2012, John Drescher wrote:
>
>>> During the backup one copy job already run and use the first tape drive.
>>> In the output I can see that 4 Jobs runs concurrently (one was the copy
>>> job). A little bit later I noticed that 2 jobs despooling data at the
>>> same
>>> time. Will this means the jobs are mixed on the tape volume?
>>>
>>>
>
> According to [1] this should not happen:
> "...While the spooled data is being written to the tape, the despooling
> process has exclusive use of the tape. This means that you can spool
> multiple simultaneous jobs to disk, then have them very efficiently
> despooled one at a time without having the data blocks from several jobs
> intermingled, thus substantially improving the time needed to restore files.
> While despooling, all jobs spooling continue running...."
>

BTW, I am not sure about this one. However it would not be the first
time that someone found an incorrect statement in the manual.

Although it may be that bacula writes volume files exclusively when
spooling. Remember volumes are divided into many 1GB files unless you
changed that.  I see that some users extend that to 5GB for LTO5
drives.


John

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