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Re: [Bacula-devel] concurrent multidrive use


Yes, sorry, I did not understand.  Bacula does not have the ability to write a 
single job to multiple drives -- normally that is called striping.  It is 
unlikely that it will be implemented any time in the near future.



On Monday 21 July 2008 18:27:43 T. Horsnell wrote:
> Thank you for that quick reply, and once again, apologies for the
> interruption, but I dont want to split the backup across multiple jobs,
> (with part of the filesystem being handled by one job and part by the
> other), because however I make the split, the content (and hence the
> size) of each part of the filesystem will be continually changing (this
> is a 16TB multiuser raid system), and so one tapedrive may well be
> mostly idle whilst the other one is continually busy. So I want, if
> possible, to do this with a single job.
>
> Cheers,
> Terry
>
> Kern Sibbald wrote:
> > Hello,
> >
> > We generally do not supply support help on this list, but I will give a
> > few tips ...
> >
> > Bacula has been able to write to multiple drives simultaneously for a
> > very long time now -- many years and many versions.
> >
> > The simplest way to do it is to use different pools for each job.
> >
> > A not so satisfactory way of doing it is to use "Prefer Mounted Volumes =
> > no". I don't recommend this as it leads to many operational problems.
> >
> > In general, if you are backing up raid disks, you should be able to tune
> > your hardware so that it will write approximately 150 MB/sec with Bacula
> > to an LTO3 drive, and so splitting jobs is not generally necessary. 
> > Getting your hardware tuned to run at those speeds is not easy and
> > requires professional help.
> >
> > Best regards,
> >
> > Kern
> >
> > On Monday 21 July 2008 17:20:11 T. Horsnell wrote:
> >>Apologies for pestering the developers list, but I cant determine from
> >>the user docs whether what I want to do is failing because I'm doing it
> >>wrongly, or simply that its not supported.
> >>
> >>I want to define a single job which will backup a single (big) raid
> >>filesystem to an autochanger which contains multiple tapedrives, and I
> >>want this job to use all the tapedrives simultaneously. This would seem
> >>to me to be a pretty standard requirement, but I cant get it to work
> >>with Bacula version 2.4.1
> >>
> >>Looking at the Storage Daemon section (6.4) in the new delvelopers docs
> >>for 2.5.2 (dated 20th July 2008 !) I see that this may not yet be
> >> possible:
> >>
> >>
> >>---cut---
> >>Today three jobs (threads), two physical devices each job writes to only
> >>one device:
> >>Job1 -> DCR1 -> DEVICE1
> >>Job2 -> DCR2 -> DEVICE1
> >>Job3 -> DCR3 -> DEVICE2
> >>
> >>To be implemented three jobs, three physical devices, but job1 is
> >>writing simultaneously to three devices:
> >>
> >>Job1 -> DCR1 -> DEVICE1
> >>         -> DCR4 -> DEVICE2
> >>         -> DCR5 -> DEVICE3
> >>Job2 -> DCR2 -> DEVICE1
> >>Job3 -> DCR3 -> DEVICE2
> >>---cut---
> >>
> >>Is what I want possible in 2.5.2, or should I wait?
> >>
> >>Cheers,
> >>Terry.
> >>
> >>
> >>
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