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
This email is confidential. If you are not the intended recipient,
you must not disclose or use the information contained in it.
If you have received this mail in error, please tell us
immediately by return email and delete the document.
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
|