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05118 - Page Faults - Anyway to reduce SAP Storage to Reduce Page Faults

05118 - Page Faults - Anyway to reduce SAP Storage to Reduce Page Faults

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Page Faults - Anyway to reduce SAP Storage to Reduce Page Faults


Hi again, Blake.

We have a 9406-S30 (central instance) with 5 GB memory. The base pool has
about 4GB of the memory and the remaining 1GB is split over the other
pools. We have about 250 named users with about 100 of them being
concurrent. We don't really have any performance problems, although I do
notice heavy paging in the pool, especially in the morning when the users
are logging on. As long as the hit ratio on the SAP buffers is good (ST02),
I don't worry. I have set my buffers according to note 44695.

Hope this helps.

Des Olwage
Snr. Systems Administrator
Goodyear South Africa
Tel. +27 41 5055441
Cell. +27 82 824 6900





"bfbray"

<blakebrayZpc To: DoNotReply@consolut.eu

mc.com> cc:

Subject: Page Faults
- Anyway to reduce SAP Storage to
18/02/2002 Reduce Page Faults

18:06

Please

respond to

SAP on System i









Our DB Server is a 9406-730 with 13gig memory. We have all users
logging on to two app servers, we try not to have any users on the DB
server. Our DB server 3 memory pools, *Machine=1gig, *base=11.9gig,
*spool=.1gig. We basically have 12gig in *BASE which runs SAP. Our
Non-DB page faults average 200-400 per second (via wrksyssts) and
will sometimes peak 1000-2000 per second. I've read in various notes
and manuals that the SAP memory definitions such as Program Buffer,
Paging Area, Extended Memory, Number of WP's do not affect System
Performance. Is this a true or did I just misunderstand what I've
seen? Are there SAP buffers or other setting which I may have
oversized and is causing the high Non-DB page faults? The sizing
tools we've used indicates 12gig should enough. Before we go and
purchase more memory we'd like to know if something can be cahnged to
reduce the amount of memory we are currently using. How much memory
are others running on the DB server?


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