Hello,

The files are indexed.  However, the index is a sparse index
and does not usually index each file.  So the bottom line is that Bacula
is able to start looking for a file at the point the last index was made
and then it must search.

The index is controlled through the directive  "Maximum File Size" as
defined in the Device resource of the SD.  The default is 1GB. The
smaller this number the more index records you will have (and the
slower the backup will run) but restores will be faster.  The bigger it is
the more efficient (smaller) the index will be but restores will be slightly
slower.

The default is a good compromise for disk for reasonable backup speeds
versus reasonable restore speeds.  For very fast taped (e.g. LTO-6) you will
want a much bigger maximum file size.  I.e. probably 5GB or more for an
LTO-6.

Best regards,
Kern

On 08/09/2016 01:53 AM, Ken Mandelberg wrote:
> A given job can backup to multiple disk files (volumes). When restoring
> a file, Bacula knows what volumes were used by the backup jobid. Does it
> also know which volumes are needed to restore a given file, or does it
> want all the volumes associated with the jobid and just seek through
> them looking for the file it is restoring?
>
> I guess I'm asking if all the volumes associated with the backup jobid
> have to be made accessible before the restore? It may not make much
> difference on an incremental, but if the file being restored is on a
> full that may be a lot.
>
> The issue is that retrieving the offline disk volumes is slow and
> and it would be nice to not retrieve unnecessary ones.
>
>
>
>
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------------------------------------------------------------------------------
What NetFlow Analyzer can do for you? Monitors network bandwidth and traffic
patterns at an interface-level. Reveals which users, apps, and protocols are 
consuming the most bandwidth. Provides multi-vendor support for NetFlow, 
J-Flow, sFlow and other flows. Make informed decisions using capacity 
planning reports. http://sdm.link/zohodev2dev
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