If you want to be sure that it was the file mismatch rather than a media error 
on the tape, look through the job logs for subsequent jobs to the one that had 
the network blip. You'll see something like:

29-Jan 08:39 backup1-sd JobId 28425: Volume "XXX675" previously written, moving 
to end of data.
29-Jan 08:41 backup1-sd JobId 28425: Error: Bacula cannot write on tape Volume 
"XXX675" because: The number of files mismatch! Volume=300 Catalog=299
29-Jan 08:41 backup1-sd JobId 28425: Marking Volume "XXX675" in Error in 
Catalog.

Ben Roberts


> -----Original Message-----
> From: Korbinian Grote [mailto:grote AT genomatix DOT de]
> Sent: 21 May 2014 14:15
> To: John Drescher; Roberts, Ben; bacula-users AT lists.sourceforge DOT net
> Subject: Re: [Bacula-users] Change a volume from 'Error' to 'Append'
>
> Thanks Ben & John for the quick answers!
>
> The volume in question was a 1.5/3 TB  LTO 5 tape and though they don't cost
> the world anymore, I'd have hated to let it go to waste. Anyway, querying the
> database showed that there was just the one single job that failed assigned to
> it, so deleting that job and marking it purged should hopefully have done the
> trick. It's now residing in the scratch pool waiting to be used, so I'll know
> as soon as one of the other pools are full...
>
> Thanks again!
>
> Korbinian
>
>
> Am 21.05.2014 um 14:46 schrieb John Drescher <drescherjm AT gmail DOT com>:
>
> >> I've observed similar issues in the past. A job fails part way through and
> the catalog is not updated leaving a mismatch in the number of files in the
> volume versus what's recorded in the catalog. This is then detected the next
> time the volume is used, and Bacula marks the volume as Error without writing
> anything to it.
> >>
> >> Given the mismatch, the safest thing to do is mark the volume as Full, and
> wait for the retention period to expire so the volume can be recycled.
> Unfortunately this wastes space (more painful when you have 100GB volumes and
> it failed within the first few gig...), so you'll need to either have
> sufficient spare space on your SD that you can cope with this, or be willing
> to sacrifice the other jobs on the volume and delete jobs+purge or purge it
> immediately to regain the space.
> >>
> >> I'm not sure how Bacula would behave if you change it straight to append;
> whether it would leave a hole in the volume, or whether this mismatch would
> corrupt subsequent jobs.
> >
> > The times I have done this there was no problem. For file based
> > volumes I keep them small 5 to 10 GB and in this case it does not
> > really waste space to mark the volume Full and or recycling the job
> > with the error.
> >
> > John
>
> --
> Dr. Korbinian Grote
> Product Manager
>
> Genomatix Software GmbH       http://www.genomatix.de
> Bayerstr. 85a, 80335 Muenchen, Germany
>
> HRB 117956 - Amtsgericht Muenchen
> Geschaeftsfuehrer: Klaus J.W. May


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