On Thursday 25 June 2009 18:28:28 Christian Gaul wrote:
> Silver Salonen schrieb:
> > PS. The limit to be able to write only one job to one disk-based device 
has 
> > been a bizzare limit that just complicates the configuration, I still 
don't 
> > understand why we have this limit in disk-based backups (the claim "Bacula 
> > uses disks as tapes" is just as bizzare).
> >
> >   
> I seem to be writing to disk based volumes just fine with multiple (5+)
> concurrent jobs.
> 
> Maybe i am misunderstanding something, but the problem isnt N jobs to 1
> (disk based) volume, it is 1-N jobs to M (>1) volumes at the same time
> which doesnt work.
> 
> Also, one pool can only use one volume at one time for one job, and one
> job can only use one SD at one time,  so that might limit you too.
> 
> Concurrent jobs (except for me currently, and only to tape) work quite
> nice. I personally opted to use spooling, in order to not have jobs
> interleaved on tape.
> 
> 
> But speaking of configuration complication, for me it complicates things
> that valid jobs (for comparing with Full, Diffs and Incrementals) are
> generated out of {Client,Fileset}and there is no way to tell it to use
> {Client,Fileset,Storage} or {Client,Fileset,Pool}.. for creating offsite
> backups i basically keep 2 identical filesets for every class of client
> because i want / need two unrelated backups on 2 different media types
> (no, copy jobs wont do because they are 2 different SDs)..
> 
> Anyways, i am rambling, but multiple concurrent jobs to one disk volume
> work fine, as long as your jobs use the same pool and are allowed to use
> the same volume. If you try to use different pools ( -> different
> volumes) for different jobs, then yes, they will wait till the SD can
> mount a volume in the second pool.

I meant the limitation from the configuration point of view - you cannot 
configure a device to accept multiple jobs concurrently. If you want to be 
able to actually do it, you have to "hack" the configuration - to show one 
actual device as different devices.

-- 
Silver

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