On 04/06/10 05:51, Kevin Keane wrote:
> There are still a few things that don't work well with bacula.
> Concurrency is one - it should really be possible to open more than
> one file-based volume at the same time. Automatically deleting
> file-based volumes from disk is another (I think the new 5.x version
> addresses that).

It is possible right now to open more than one file-based volume at a
time.  You simply need to define multiple storage devices under the same
storage daemon; each device can have one volume open at a time.
However, if multiple volumes are being written at a time, this merely
exchanges volume interleaving for disk fragmentation.  The odds are good
the data will actually end up in the same places on disk; it will just
appear, from the point of view of scanning volumes, to be unfragmented,
because the disk system hides the fragmentation from you - exactly as it
is supposed to.  As previously mentioned, this can be overcome
essentially only by using a complete custom filesystem and disk driver
that treats disks like tapes.

Bacula-5 does not automatically delete expired disk volumes; it does
contain a feature to automatically truncate them to zero bytes.  Note
that this feature is dangerously broken in 5.0.0 (in which it was a new
feature), and should not be used in that version; if you want to use the
volume truncation feature, you must run 5.0.1 or later.

Automatic volume deletion can be handled fairly simply using an admin
job that runs a script to delete expired volumes; I've attached mine as
an example.


-- 
  Phil Stracchino, CDK#2     DoD#299792458     ICBM: 43.5607, -71.355
  alaric AT caerllewys DOT net   alaric AT metrocast DOT net   phil AT 
co.ordinate DOT org
         Renaissance Man, Unix ronin, Perl hacker, Free Stater
                 It's not the years, it's the mileage.

clean_volumes
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