On 9/5/2014 3:16 PM, Dimitri Maziuk wrote:
> On 09/05/2014 01:41 PM, Josh Fisher wrote:
>> On 9/5/2014 1:48 PM, Dimitri Maziuk wrote:
>>> I've another bacula setup that writes to a single filesystem. It's been
>>> running with about zero problems (knock on wood) and zero maintenance
>>> for years: auto-labelling works, volume recycling works, the only
>>> problems are spinning rust and lsi's ugly raid manglement software.
>> The whole point of vchanger is to use multiple filesystems as a single
>> autochanger.  For a single filesystem I would recommend Bacula's
>> built-in disk autochanger capability or else Bacula's standard disk
>> storage handling.
> Right, that's my point: when you use bacula's standard disk storage
> handling you get
> - automatic volume labeling,
> - automatic volume recycling,
> and generally near zero maintenance overhead.
>
> With vchanger I
> - have a job split over different disks,
> - need to manually fix the catalog every time I sneeze,

Fix the catalog??

> - get into weird "intervention needed" loops where bacula "mounts" a
> volume it's just filled up and complains it couldn't write to some other
> volume it shouldn't have tried in the first place.

That is related to the 'update slots' not being issued when a change 
occurred. This problem also occurs if I forget to issue 'update slots' 
when I change tape cartridges in a tape autochanger, so I don't really 
consider that a huge disadvantage.

> Ergo, if you want to use multiple filesystems, the smart move would be
> to "fake" the standard disk storage over multiple filesystems.

How?

> (As for built-in disk autochanger, Kern's explanation of it never made
> much sense to me: maybe it's useful for debugging or something...)

Well, true, it is a [mostly] undocumented feature. I have tested it and 
it appears to work well, but I cannot say I have used it extensively in 
production. Kern has stated that it is used in production, though I 
don't know when/where.



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