On Sunday 23 July 2006 22:44, Shawn Robert Lesniak wrote:
> Greetings,
>    I am the system administrator at a lab at UCR.  We have a ~800GB RAID
> 5 array that was being backed up using bacula that suffered severe data
> loss (mostly due to reiserfsck) that was being backed up to an Exabyte
> tape changer system.  Unfortunately, the bacula database happened to be
> on the array.  I'm trying to rebuild the database, however, with 20
> tapes that are each taking ~4 hours to scan (I'm still scanning the
> first one) this is going to take a very very long time.  Is there a
> faster way to do this?
> 
> I'm using bacula 1.36.2-2sarge1 on Debian-stable.

Most users (I hope) including myself, back the database up nightly after doing 
the backups, and when we back it up, we write the bootstrap file to a 
different machine.  With the bootstrap file, you can reload the database 
without a database.

Alternatively, if you were backing up your database in a separate backup job, 
it is possible to build your own bootstrap file from the log output and a 
little detective work of exactly where it is on the tape where it was 
written.  This is described in the restore chapter of the manual, if I am not 
mistaken.

There is also a section in the manual that describes the steps to take before 
putting a Bacula system into production -- it specifically speaks about 
bootstrap files.

If your database is backed up, and if you know on which tape it is, you can 
scan just that tape, then reload it from a partially reconstructed catalog.

It is always better to reload your database from a backup than to scan tapes, 
because it is faster, and scanning never restores everything that was in the 
database, only the essentials.

Regards,

Kern


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