Arno Lehmann wrote:
> Hi,
>
> 04.12.2008 19:41, Steve Thompson wrote:
>
>> Bacula 2.4.2.
>>
>> I have just added a second pool to an all-disk configuration and have a
>> question concerning automatic volume numbering. The relevant details are:
>>
>> Pool {
>> Name = Foo_Pool
>> Storage = Foo_Storage
>> Label Format = "Foo-"
>> ...
>> }
>>
>> Pool {
>> Name = Bar_Pool
>> Storage = Bar_Storage
>> Label Format = "Bar-"
>> ...
>> }
>>
>> Single catalog. When the second pool was added, there were 3260 volumes in
>> Foo_Pool (from Foo-0001 to Foo-3260). Everything works, but the first
>> backup that went to Bar_Pool created a volume called Bar-3261, when I was
>> expecting Bar-0001. Why is this?
>>
>
> That's because Bacula uses the overall number of known volumes, not
> the number of volumes per pool. This decreases the probability that it
> tries to create a volume which already exists (though it doesn't
> absolutely prevent that).
>
> Just imagine that you delete one volume from the pool - the next one
> automatically created will get an existing name.
>
> In setups where the volume names are expected to be numbered
> sequentially, I just create the volumes manually (or by script, if a
> large number of volumes will be needed).
>
> Arno
>
Actually, bacula doesn't use the overall number of known volumes, but
rather the media ID - which, I believe, is a database key. So if you
keep creating and deleting volumes, the number will still increment.
Interestingly, if you use variable expansion, bacula *will* use the
number of volumes in the pool (there is, as far as I can tell, no
variable "mediaID") - and it may indeed cause the collision you mention.
Suggestion: if bacula detects such a collision using the number of
volumes in the pool, use the next-lower number, and keep decrementing
until it finds an available one (mathematically, there will always be
one before the counter reaches zero). This will allow you to "backfill"
the pool.
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