Hello Stefano,

performance tuning isn't easy but after what I have learned there are some
parameters that can have a great impact on backup/restore performance:

On the client side:

Increase the value for TXNBYTELIMIT (e.g. 25600 according to the old ADSM
v3.1 performance tuning guide)
Increase the value for RESOURCEUtilization to a value > 3 (remember: no.
of data sessions = resourceutilization - 1, because there is always one
control session)
Set TCPBuffsize 31 (With TWO f !!!)
Set TCPNodelay YES
Set LOGMODE QUIET (For scheduled sessions)
Set QUIET (For non-scheduled sessions)
Set COMPRESSION No

On the server side:

Increase the TCPWINDOWsize parameter to 63 (Important for the backup
performance)
Set TCPBufsize 32 (With ONE f !!!)
Use TCPNOdelay YES
Set TXNGROUPMAX to 256
Set USELARGEBUFFERS to YES

Good luck!

Mit freundlichen Grüßen,
Met vriendelijke groeten,
With best regards,
Bien amicalement,

CU/2,
                Dirk Billerbeck


Dirk Billerbeck
GE CompuNet Kiel
Enterprise Computing Solutions
Am Jaegersberg 20, 24161 Altenholz (Kiel), Germany
Phone: +49 (0) 431 / 3609 - 117, Fax: +49 (0) 431 / 3609 - 190,
Internet: dirk.billerbeck @ gecits-eu.com


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Stefano_Massi AT SACMI DOT [email protected] on 15.03.2001 15:41:53

Please respond to ADSM-L AT VM.MARIST DOT EDU

Sent by:  ADSM-L AT VM.MARIST DOT EDU


To:     mailbox.dekelnsm
cc:
Subject:  TSM vs NSR Performance
                                                                            
                                                                            
 -------------------------------------------------------------------------- 
Hi all,
Hi all,

we are using TDP for SAP R/3 v3.1.0.4 for NT/Oracle, on a client connected
to a TSM Server 4.1.2.0 (Windows NT) through a Gigabit network. An online
backup of the whole DB (about 130 MB), directly to DLT tapes with two
sessions, lasts over 2 hours, that means about 60 GB/h.

Before migrating to TSM, we were able to back up the same database in about
1 hour and 15 minutes (about 105 GB/h) using Legato NSR.

I tried to change network parameters to improve the data transfer rate, but
without success. So I tried to backup to disk storage pools and I got a
poor 30 GB/h.

Finally, I decided to define disk storage pools in EMC2 storage disks, back
up directly to them, and I obtained about 107 GB/h! But my customer doesn't
want to "waste EMC storage space for TSM storage pools", so I'm looking for
an alternative  solution...

Any ideas?

Thanks in advance,
               Stefano Massi