Try changing your Maximum Network Buffer size in your bacula-sd config.

Something like
  Maximum Network Buffer Size = 262144 #65536
  Maximum block size = 262144

Keep in mind that this will make your sd unable to read previous 
backups, IIRC.

Search archives for this parameter, e.g.
http://old.nabble.com/LTO-4-performance--td17407840.html

Regards,
Alex

On 04/28/2011 11:08 AM, Jason Voorhees wrote:
> Hi:
>
> I'm running Bacula 5.0.3 in RHEL 6.0 x86_64 with a Library tape IBM
> TS3100 with hardware compression enabled and software (Bacula)
> compression disabled, using LTO-5 tapes. I have a Gigabit Ethernet
> network and iperf tests report me a bandwidth of 112 MB/s.
>
> I'm not using any spooling configuration and I'm running concurrent
> jobs, just only one. This is the configuration of my fileset:
>
> FileSet {
>         Name = fset-qsrpsfs1
>         Include {
>                 File = /etc
>                 File = /root
>                 File = /var/spool/cron
>                 File = /var/run/utmp
>                 File = /var/log
>                 File = /data
>                 Options {
>                         signature=SHA1
>                         #compression=GZIP
>                 }
>         }
> }
>
> My backups were running with a minimum of 54 MB/s and a maximum of 79
> MB/s. Are these speeds normal for my scenario? What could be the best
> speed I could achieve with an optimal Bacula configuration considering
> that the network isn't loaded at the time that backups always run? I'm
> concerned the difference of speeds between the maximal supported by my
> network (112 MB/s) versus the speed of my backups (54 ~ 79 MB/s).
>
> I hope someone can give me some advices to enhance the performance of
> my backups.
>
> Thanks
>
>


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