[OpenAFS] Unable to restore incemental dumps from backup file

[Andrew Bacchi]

I create a new volset file for each backup incremental, instead of 
appending.  The bu database will keep track of which file it needs to 
restore a volume from.  You can check the list of volset files required 
by using "-n" to the backup restore command.  It appears that appending 
to a file does not work.  I typically end up with 76 bu volset files per 
semester.  I have no problem restoring a volume.

Jasper Moeller wrote:
> Hi,
>
> we want to switch from backup to tape to file based backup. We append 
> our incremental dumps to the full backup file. However, we are not 
> able to restore a volume for which an incremental dump exists, butc 
> only complains:
>
> Restore
> Restoring volume home.moeller.restored
> Can't read FileBegin on tape
>      butm: unexpected tape datablock
> Can't restore volume home.moeller.restored
>      butm: unexpected tape datablock
> Restore: Skipping remainder of volume home.moeller.backup (536871263)
> Restore: Finished
>
> Strangely enough, we can restore a volume from the same file for which 
> no incremental dump has been appended, so it must have to do something 
> with the incremental stuff or the append-to-file.
>
> butc is still an old 1.2.11 one, running on a remote machine - we'd 
> rather prefer to leave it that way for the moment than to upgrade the 
> backup server.
>
> TIA
>
> JM