On Friday 26 June 2009 14:26:49 John Drescher wrote:
> >> 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. 

Yes, exactly, but to my mind this is a configuration "hack" - when I add new 
pools, I have to remember that new devices must be added for these too, 
because that's the way Bacula does it.

> 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.

Hmm.. actually I haven't tried that.. I'll take a look.

-- 
Silver

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