You were not precise on the adapter. Was it 2940 (Fast SCSI-2, 10 MB/s),
2940W (F/W SCSI-2, 20 MB/s), 2940U, 2940UW or 2940U2W ? SCSI bus speed
might be part of the bottleneck.
What drivers and at what version are you using? Try IBM ones from
www.pc.ibm.com/support.

Zlatko Krastev
IT Consultant






Colby Morgan <cmorgan AT DATA-TRONICS DOT COM>
Sent by: "ADSM: Dist Stor Manager" <ADSM-L AT VM.MARIST DOT EDU>
12.06.2003 16:11
Please respond to "ADSM: Dist Stor Manager"


        To:     ADSM-L AT VM.MARIST DOT EDU
        cc:
        Subject:        TSM LTO 3580 Performance


We in the process of moving to an IBM 3580 external LTO drive for manual
offsite vaulting of primary storage pools.  I have read several older
reports on http://msgs.adsm.org about poor performance with TSM, LTO and
small files.  We are experiencing the same behavior and I was just curious
if anybody has ran into this lately.  We see about 10-15GB/hour with small
files and 42-57GB/hour on larger files.

We are running TSM 5.1.6.5 on Win2k SP3.  The drive is an external IBM
3580
and is the only device hooked to an Adaptec 2940 SCSI controller.  We are
also running v5.0.5.4 of the IBM 3580 drivers.

I maxed out the following server options (which helped):
MoveBatchSize     1000
TxnGroupMax             256

I also set the drive parameters via ntutil as described in this Redbook
(which also helped):
http://www.redbooks.ibm.com/redpieces/pdfs/sg246268.pdf

Anybody else ran into these problems?


Thanks,

Colby