On Friday 02 March 2007 13:27, Simon Ekstrand wrote:
> Kern Sibbald wrote:
> > On Thursday 01 March 2007 21:19, lists wrote:
> >> Hi,
> >>
> >> Kern Sibbald skrev:
> >>> Hello,
> >>>
> >>> >From what you have described here, it appears that Bacula is recycling
> >>> > a
> >>>
> >>> volume while it is being used or has been reserved for use. I am not
> >>> sure what is going on for the following reasons:
> >>>
> >>> 1. You speak of rotation of volumes, but there is no such concept in
> >>> Bacula. I am assuming you mean recycling of volumes. Please try to use
> >>> the right terminology as it helps ensure proper understanding.
> >>
> >> Sorry about the lack of proper terminology. No, I don't mean recycling,
> >> I mean when bacula switches from one Volume in a pool to the next, ie.
> >> what happens when 'Volume Use Duration' is reached for a volume. I'm not
> >> sure if that particular concept has a name.
> >
> > There is probably no explicit term, but if you speak about "expiration"
> > of the volume use duration, I'll understand.
> >
> >>> 2. It appears that you are using Volume retention periods to attempt to
> >>> force Bacula to use a different volume. This absolutely will not work.
> >>> It is probably the main reason you are having problems.
> >>
> >> Sorry for the misunderstanding, no that's not what I'm trying to do.
> >> A typical sample pool definition we're using:
> >>
> >> Pool {
> >> Name = Default-Windows-94
> >> Pool Type = Backup
> >> Recycle = yes
> >> AutoPrune = yes
> >> Volume Retention = 7 days
> >> Volume Use Duration = 23h
> >> LabelFormat = "Vol-windows-94"
> >> }
> >>
> >> The problem we're encountering is when:
> >> * Job A starts running.
> >> * 'Volume Use Duration' is reached.
> >> * Job B starts running but fails due to A still running and writing to
> >> the old volume, preventing the new volume from being used.
> >> * Job C, D, E have the same problem as B.
> >> * Job A finishes.
> >> * Job F starts running, the new volume is used since the old volume is
> >> no longer being written to, so job G succeeds.
> >> * Job G, H, I succeed.
> >
> > I can see a potential problem here, but since you snipped out the
> > original text, I'm not sure what is going on. I'm not sure that this is
> > really a bug, as it seems more likely to be a feature request. However,
> > if you want to submit a bug report, I'll look at it. Be sure to include
> > the above summary of what happens, your conf data submitted here, and as
> > much job output showing the problem as possible.
>
> I suppose the feature request, if any, in this case would be that
> 'Volume Use Duration' be handled in the same graceful manner as 'Maximum
> Volume Bytes'.
>
> > If possible, please try to explain why the volume use duration is
> > expiring while a job is running. Normally that happens at the end of a
> > job -- perhaps it is because you have multiple simultaneous jobs writing
> > so there may be a "race" condition here.
>
> I'll submit a bug report with as detailed information as possible so
> it's available if someone decides to look into this further. I'm happy
> with having solved the issue using Maximum Volume Bytes as detailed in
> my other mail sent in this thread today.
I think I pretty much understand the problem, so it would be better at this
point to submit a Feature Request rather than a bug report. It is a close
call whether it is a bug or a feature, but in any case it is not something
easily fixed and requires new code that I would only add in a future version,
so a feature request seems more appropriate.
>
> Thanks again for the quick help.
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