This comes up periodically on the list.  Check this thread for more 
settings you'll need to tweak to get more write speed:

http://marc.info/?t=128999803800006&r=1&w=2

> Subject: [Bacula-users] Copy Job performance issues
> To: bacula-users <bacula-users AT lists.sourceforge DOT net>
> Message-ID: <D91FA3C4-4D90-46B2-9F14-845FBBD4BA9D AT uni-koblenz DOT de>
> Content-Type: text/plain; charset=us-ascii
>
> Dear bacula users,
>
> I have a problem concerning the speed of copy jobs. My setup is:
> - bacula server is OpenSuSE 11.3, version 5.0.3 using postgres, 2 Xeons (4 
> cores) and 8 GB memory.
> - Attached is an iSCSI-RAID containing File devices
> - Copy Jobs run to a Quantum Scalar 50 Tapelibrary with 2 LTO4 tape drives. 
> The library and the tapes are connected via eSATA. According to wikipedia, 
> LTO4 should transfer 120MB/s without compression. Compression is enabled.
>
> My backups go to the iSCSI-RAID. I run CopyJObs every day to copy all 
> uncopied jobs to tape.
> My problem is, that my copy jobs run with max. 45 Mbyte/s
>
> I checked the following:
> - btape shows a maximum speed of 80MByte/sec.
> - I can read about 150 Mbyte/s from the RAID device
> - Copying data from RAID to tape using dd I get rates about 80 MByte/s
> - While copying the cpu load is about 20-50% (bacula-sd)
>
> So it seems as if bacula-sd itself slows the copy jobs down, but I cannot 
> imagine, why. Maybe it is a configuration issue, but reading the manuals 
> didn't help.
>
> Configuration of the tape device in bacula-sd.conf:
>
> Autochanger {
>   Name = "Scalar50-2"
>   Device = "LTO4-0"
>   Device = "LTO4-1"
>   Changer Device = /dev/tape/by-id/scsi-3500e09e0bb562001
>   Changer Command = "/usr/lib64/bacula/mtx-changer %c %o %S %a %d"
> }
>
> Device {
>   Name = "LTO4-0"
>   Device Type = Tape;
>   Media Type = LTO4
>   Archive Device = /dev/tape/by-id/scsi-3500110a00104374e-nst
>   AutomaticMount = yes;
>   AlwaysOpen = yes;
>   RemovableMedia = yes;
>   RandomAccess = no;
>   Autochanger = yes
>   Drive Index = 0
>   Spool Directory = /var/spool/bacula
> }
>
> Device {
>   Name = "LTO4-1"
>   Device Type = Tape;
>   Media Type = LTO4
>   Archive Device = /dev/tape/by-id/scsi-3500110a0012be1ee-nst
>   AutomaticMount = yes;
>   AlwaysOpen = yes;
>   RemovableMedia = yes;
>   RandomAccess = no;
>   Autochanger = yes
>   Drive Index = 1
>   Spool Directory = /var/spool/bacula
> }
>
> Any ideas?
>
> --
> Kind regards
> Christoph
> _________________________________________
> Christoph Litauer
> Uni Koblenz, Computing Centre, Office A 022
> Postfach 201602, 56016 Koblenz
> Fon: +49 261 287-1311, Fax: -100 1311
>
>


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