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Re: [Bacula-devel] Automatic labeling (bug 1014)
On Monday 28 January 2008 19.45:55 Luke Reeves wrote:
> Greetings all. I've been working at tracking down what I thought was a
> bug in Bacula. Automatic volume labels prior to Bacula 2.2.5 were based
> on the number of volumes in the pool where the new media is created and
> in that version a change was made so that the incremental component of
> the label was based on the maximum media ID across all volumes. The
> original behavior is restored by slightly modifying the SQL in newvol.c:
> SELECT MAX(MediaId) FROM Media,Pool WHERE Pool.PoolId=%s
> SELECT COALESCE(MAX(MediaId), 0) FROM Media WHERE PoolId=%s
> So just as I was about to mail that, I found bug 1014
> (http://bugs.bacula.org/view.php?id=1014) which describes this as
> changed behavior and the documentation was updated to reflect that. I
> can't tell from the bug if this is intentional or not, but to me it
> seems very much like a regression.
No, it is not a regression. If you delete a volume, the previous algorithm
> Consider a site with multiple pools,
> one for each type of backup. You might have the numbers in your labels
> scattered across all of your pools, so instead of "FULL0001, FULL0002,
> INC0001, INC0002" you would have "FULL0001, INC0002, FULL0004, INC0004".
> This is also a problem since labels for the tapes are usually ordered
> in bulk (like say FULL0001 to FULL0120) and skipped numbers will just
> lead to confusion.
Well Automatic volume names is just that, Bacula *automatically* generates the
volume names and all that really counts for it to work is that they are
unique. Automatic labeling was never guaranteed (even with the old
algorithm) to produce unique sequential label names ...
If you want volume names to follow a specific pattern, then you need to either
pre-label them manually (or using barcodes), or use something like Bacula
variables or Python scripting to ensure that they are sequential.
> I found a reference on newvol.c to a bug 921, but I'd think that the fix
> for that causes a larger bug.
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