Simon Gray schrieb:
> Alex Chekholko wrote:
> >
> > I searched the archives and found a thread on bacula-users from Dec07 with 
> > subject "LTO-4 backup rates", and also a thread on bacula-devel from Sep07 
> > with subject "Bacula performance with a 64512 block size".
> >
> > I just got a new IBM TS3310 with 3 LTO-4 SAS drives, and after my initial 
> > Bacula setup, I'm getting ~23MB/s writing to the drive.
> >   
> Hi Guys,
> 
> We're running a TS3100 with a ULT3580-TD4 (LTO4) via SAS (LSISAS1068 
> controller) as well. We spool all the data locally via rsync then use 
> bacula directly to tape and disk I/O isn't a problem (16x 750gig SATA 
> disks in raid 5 (3ware 9550SXU)) , and we're also still only getting 
> around 25-30mb/sec to tape.
> [...]

Without spooling and without changing the block size, I get 80-90 MB/s
with a HP Ultrium 1840 SCSI LTO-4 drive.

I don't think that changing the block size will give you 2-3 times
better throughput. There must be something basic going wrong, but I'm
not an SAS expert.

Ralf

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