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Performance guideline for Windows and Unix memory : Page In   Page Out

Last Modified: 2013-11-10

Our BMC Patrol & CA Unicentre have been collecting memory statistics
( Page In / Page Out)  all these years for Windows 2003 & Unix (Solaris,
Redhat Linux & HP-UX) and one senior director asked what's the industry
guideline of healthy or unhealthy values for these memory readings.

Any website / inputs  will be appreciated.

I think for Unix memory, it's the "Scan rate" that matters & I think I saw
one thread in a forum that suggested that "Scan rate" above 5 is unhealthy.
That thread also mentioned that for Unix,  "Page Out" value above 5 is
unhealthy while "Page In" value is immaterial.  Are these suggestions correct?

If the above suggestions are valid, would occasional one second spike of
above 5 (for scan rate & Page Out) a cause for concern or we have to have
the value sustained at above 5 for say over a period of time (say 10 seconds?)

Are the above suggestions for Unix valid for Windows?

What about Windows, what's a good indicator of memory health & at what
threshold value we should consider adding memory?  Are the "Free Memory"
shown in Windows Task Manager a good indicator, ie if the value of "Free
Memory" is less than 5% of the total physical memory, then it becomes a
cause for concern?
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