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Understanding vSphere Active Memory

Here’s an interesting blog post on what ‘active’ memory is – it’s probably not what you expect:

The conclusion is that active memory only shows what memory pages have been touched over the last sampling peiod (20 seconds in vCenter, 5 secs in ESXTOP) – it does not describe if they are the same memory pages or different memory pages between sampling periods.

Therefore active memory cannot be used as a “rightsizing” counter on its own. In-guest memory counters are the most accurate and should be used in combination with vSphere memory counters.

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