>> I do this every single day at home. 5 jobs concurrently write to the
>> same exact volume.
>
> My original claim was made in the context of disk-based backups (ie. multiple
> pools as I explained in the same message). Using the same exact volume (or
> pool) with disk-based backup-system is quite a big limitation to my mind.
>
Again there is no big limitation with disk.

To achieve concurrency on a single device (tape, dvd or disk) you need
a single volume and all jobs must be of the same priority. As a result
of the requirement of needing a single volume loaded in a single
storage device you can not schedule different Pools to the same
storage device and expect them to all run at the same time. To get
around this on disk based backups you can easily create additional
storage devices. There is no limitation on the number of these and
they can all point to the same storage location. You can also use the
virtual disk changer so with that all jobs can go to a virtual
autochanger device and bacula will automatically manage the loading of
pools. With multiple storage devices you will be able to run multiple
concurrent jobs of the same priority to disk with different pools.

-- 
John M. Drescher

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