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Page file size for SAP.

Posted on 2002-07-24
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Sorry don't know SAP version, it's the customers server. Windows 2000 with 4GB ram and 4.5GB page file.

SAP have recommended increasing to 16GB swap after their monthly performance monitoring.
Microsoft say you should have each page file on a seperate hard disk so this means buying 4 more disks plus an enclosure to put them in since windows max page file is 4GB.

Why does having this much swap improve SAP's speed when normally Windows won't use more swap than RAM plus 25%.

In the SAP environment is it still important to have the 4 swap files on seperate spindles or can they get the required performance by putting all 4 swap files on a single partitioned disk drive?
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Question by:andyalder
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5 Comments
 

Expert Comment

by:zbde00
ID: 7182968
to  andyalder
what is SAP?is Satellite Automation System?
thanks!
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Expert Comment

by:DanC3
ID: 7225534
see www.sap.com for details about SAP.
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Accepted Solution

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madappattu earned 400 total points
ID: 7261157
Normally like Windows handling pagefiles(Virtual mem), SAP handles its mem & swap by its own. becasue as you must be knowing it has lots of internal buffers.
 "Microsoft say you should have each page file on a seperate hard disk " for its own performance and safety reasons. It is not a must that you do the same for SAP also. But if they repetedly says (in next Early watch report also) to increase then you can buy one disk and allocate(internally).
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by:andyalder
ID: 7261251
Thanks.

I also found a performance stress test report that said the page file was not often accessed so I'll put all 4 swap partitions on a single disk.
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Expert Comment

by:drdrake
ID: 7414583
Well "normally" the page file in SAP should be 4xtimes the RAM on a central system (Database+Central instance) but the maximum of 10GB. If you have read peformance problems you could isolate the swap file on its own raid1 disk.
You should also try to applie note: 203924
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