Alex Chekholko wrote:
> Hi all,
>
> 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.

    Running Jobs:
    JobId 117 Job NightlySave.2008-05-23_08.33.26 is running.
        Backup Job started: 23-May-08 08:33
        Files=6,272 Bytes=31,977,317,014 Bytes/sec=30,454,587
        Files Examined=6,274
        Processing file: /storage/badger/mysql-dbs/order_system.sql.gz
        SDReadSeqNo=5 fd=5
    Director connected at: 23-May-08 08:50

Does anyone know, if there is anyway I could increase the blocksize on 
the /dev/st driver to speed up performance? Using the IBMtape0 driver 
while testing, I've had over 100mb/sec from disk to tape using the 
larger block sizes - although this driver doesn't seem to work well with 
mt and mtx...

Any ideas?

Thanks,

SG

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