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Relationship between pages/sec, page faults/sec, and available MB

Posted on 2011-03-16
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On a Windows 2008 SP2 server, can someone explain the relationship between these three counters and what their thresholds should be?

Are there any other similar counters in perfmon we should take into account when troubleshooting a slow server?
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Question by:bruce_77
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dan_blagut earned 2000 total points
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"What is pages/sec performance counter ?"

The pages/sec performance counter is a memory related counter that measures the hard page faults. A hard page fault occurs when a memory page is not in the immediate memory and needs to be fetched from the disk. It is a very important counter that can potentially help us find bottlenecks. From my experience, a good warning threshold value for the pages/sec counter would be 10 and critical threshold value would be 20.

"What is page faults/sec performance counter ?"

The page faults/sec performance counter is also a memory related counter that measures the hard page faults and the soft page faults. A soft page faults occurs when the page is located in the immediate memory but still needs to fetch it for the current process. For example, Word has opened the spellchecker, and now Outlook wishes to use it, there is no need for another call to the disk as the spellchecker is already in memory. Zero is the optimum measurement and any mesurement higher then that delays the response time, however usually the value of the page faults/sec is at least twice the size of pages/sec.

Available MB

When the RAM is full, the server will use the swap file. The access time for RAM is at least 100 time smaller than HDD. So when a PC or server use more memory than RAM capacity it will be slow down...

Dan

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