> If I understand the documentation correctly, raising dir.conf Maximum
> Concurrent Jobs will interleave multiple backups to tape, which I want
> to avoid.

Not if you use data spooling.

>> Bacula is capable of only one spool file, it seems?

Each job is spooled to a separate file, which is deleted as soon as the
job is completely despooled.

>> I suppose a more specific question would be "can I have Bacula close a
>> spool file if it cannot despool, and write to tape when it is
>> available?"

AFAIK Bacula will not start a job unless it can mount a suitable volume,
even if the job is configured to use data spooling.

However, if you have multiple jobs and enable concurrency, you can start
a batch of spooled jobs at the same time (ie when the tape is empty);
completed jobs will then be despooled one at a time.
In this scenario a blocked drive will only halt despooling: incomplete
jobs will keep spooling until they are all finished or the configured
spool size limit is reached.

andrea

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