On Thu, Feb 26, 2009 at 02:23:04PM +0000, Graham Keeling wrote:
> I've now looked at the bacula code a bit, and what I think it does is this
> (bear in mind that I'm not one of the proper bacula development guys, so I
> might be talking utter rubbish here):
> 
> When you tell it to restore something, it creates a single .bsr file.
> Though the director knows the Storage that has each volume, the .bsr file
> does not contain that information.
> The director then takes that .bsr file and sends a "run job=" command back
> through the bconsole interface, like this (with the %s bits filled in -
> src/dird/ua_restore.c):
> 
>          "run job=\"%s\" client=\"%s\" restoreclient=\"%s\" storage=\"%s\""
>           " bootstrap=\"%s\" files=%u catalog=\"%s\""
> 
> As you can see, the Storage is set outside of the bootstrap file, and I think
> you can only specify one of them. So, that single Storage gets told to restore
> from all of the volumes, even if the director knows that some of the volumes
> shouldn't be there.
> I suppose that it's possible that if there was a volume in that place with the
> correct label, it would happily restore from it and give you odd files.
> 
> One kludgy solution that I may have a go at trying is to make the director
> write out a separate .bsr file containing the correct set of volumes that it
> needs for each Storage, and then doing multiple "run job=" commands. This
> will set off multiple restores and you'd end up with multiple confirmation
> messages.
> It might all go horribly wrong if you're using plugins, mind.


...and another thing:
I just noticed that the Virtual Backup / Consolidation stuff seems to work in
a similar fashion. Unless I'm missing something, it looks like it just creates
a single .bsr file and sends it off to a single Storage.


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