1) Bacula is indeed able to seek within a tape.  If you're having trouble 
with this functionality you need to look at the storage daemon options at

http://www.bacula.org/3.0.x-manuals/en/install/install/Storage_Daemon_Configuratio.html#SECTION00830000000000000000

Fast Forward Space File
Forward Space Record
Maximum File Size

The first two should probably be left at their default values but the 
Maximum File Size value may need to be increased if you're using LTO-4 
hardware.

2) If you pick a file that's on one of the other 9 tapes in your example it 
should be fine.  The big problem will be if you need files on that bad 
tape.  In that case you won't be able to get it.  So here's an example...
Day one, full backup winds up using 9 full tapes and part of a 10th tape. 
Day two, that 10th tape is appended to, but then breaks.  In this case, 
you'll probably be able to restore anything except the files on that last 
tape.  I believe bacula restores the files in the order they were written, 
so any kind of restore you do that invovles tape 9 and tape 10 will get all 
the tape 9 stuff just fine but then you'll need to cancel it because you 
won't be able to give it tape 10.  However, the tape 9 files will already 
be written and canceling the restore does not delete them.

    Bob


> Date: Sun, 13 Dec 2009 11:30:29 +1300
> From: Richard Scobie <richard AT sauce.co DOT nz>

> If a tape is damaged in a multi volume archive, is it possible to 
> recover all the data from the rest of the set?
> 
> I understand Bacula is not currently able to seek within a tape in order 
> to recover a file - the tape must be read sequentially.
> 
> In a multi volume archive, does it need to read through all 10 LTO4 
> tapes in order to recover files from the 10th tape?
> 
> Regards,
> 
> Richard


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