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Microsoft Exchange Performance Counters

Microsoft Exchange Common Memory Paging counters

The following table shows common memory paging counters.

Counter Name Description
Memory\Page Reads/sec Indicates data must be read from the disk instead of memory. Indicates there isn't enough memory and paging is beginning. A value of more than 30 per second means the server is no longer keeping up with the load.
Memory\Pages Input/sec Shows the rate at which pages are read from disk to resolve hard page faults. Hard page faults occur when a process refers to a page in virtual memory that isn't in its working set or elsewhere in physical memory, and must be retrieved from disk. When a page is faulted, the system tries to read multiple contiguous pages into memory to maximize the benefit of the read operation. Compare the value of Memory\Pages Input/sec to the value of Memory\Page Reads/sec to determine the average number of pages read into memory during each read operation.
Memory\Pages Output/sec Shows the rate at which pages are written to disk to free space in physical memory. Pages are written back to disk only if they are changed in physical memory, so they are likely to hold data, and not code. A high rate of pages output might indicate a memory shortage. Microsoft Windows writes more pages back to disk to free up space when physical memory is in short supply. This counter shows the number of pages, and can be compared to other counts of pages, without conversion.
Memory\Pages/Sec Shows the rate at which pages are read from or written to disk to resolve hard page faults. This counter is a primary indicator of the kinds of faults that cause system-wide delays. It's the sum of Memory\Pages Input/sec and Memory\Pages Output/sec. It's counted in numbers of pages, so it can be compared to other counts of pages, such as Memory\Page Faults/sec, without conversion. It includes pages retrieved to satisfy faults in the file system cache (usually requested by applications) and non-cached mapped memory files.
Memory->Transition Pages Repurposed/sec Indicates system cache pressure.