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05123 - Page Faults - Anyway to reduce SAP Storage to Reduce Page Faults

05123 - 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 all,

in the recent days we had a similiar problem on our iSeries 830 with two
lpar, V5R1M0 and R/3 4.0B, the storage is driven by an IBM ESS Shark.
Before partitioning we had two instances on the same 830 w/o lpar (Prod. +
Test), the machine itself was connected via SCSI to the Shark and the
performances seemed to be good.
Now we have two lpar's on our iSeries:

1. Productive lpar, 6 processors + 9Gbytes memory, fiber channel connection
to the ESS, machine memory pools as follow:
450,00 335,56 +++++ *MACHINE
8337,25 47,19 150 *BASE
0,25 0,00 1 *SPOOL
50,00 0,00 20 *INTERACT

2. Test lpar, 2 processors + 3Gbytes memory, scsi connection to the ESS,
machine memory pools as follow:
264,77 169,44 +++++ *MACHINE
2581,08 0,32 70 *BASE
0,34 0,00 2 *SPOOL
149,79 0,00 20 *INTERACT

SAP performances are unbelievable bad on our productive lpar, lots of DB
page faults with peaks of 2000 and more per seconds.
Maybe we have oversized any of the buffer, paging or EM ?
Any hints ? I can send the ST02 screenshot, if you want.
Thanks in advance.

----------------------------------------------------------------------------

Franco Tassone - (Emsar IS) tel.: +39-085-4442248
----------------------------------------------------------------------------







"Gueldenpfennig,

Volker" To: "'blakebrayZp...'"
<blakebrayZp...>
<volker.gueldenpfenni cc: "Sap400 (E-mail)"
<sap400Zm...>
gZs...> Subject: RE:
Page Faults - Anyway
to reduce SAP Storage to
Reduce Page Faults
18/02/02 17.19









Hi,

the amount of memory depends on the usage of the DB-server. Do you run
workload on the DB-server or don't you run workload at all there ?
Normally a bit oversized buffers or EM don't increase the page-faults as
this is then not used as well and paged out.

Could you send over a screenshot of ST02 on the DB-server after a few days
running ?

Regards

Volker

> -----Original Message-----
> From: bfbray [mailto:blakebrayZp...]
> Sent: Montag, 18. Februar 2002 17:06
> To: DoNotReply@consolut.eu
> Subject: Page Faults - Anyway to reduce SAP Storage to
> Reduce Page Faults
>
>
> 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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