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Page file size for SAP.

Posted on 2002-07-24
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Last Modified: 2013-12-08
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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by:zbde00
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to  andyalder
what is SAP?is Satellite Automation System?
thanks!
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by:DanC3
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see www.sap.com for details about SAP.
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madappattu earned 100 total points
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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
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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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by:drdrake
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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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