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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