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Guest Memory % vs actual guest memory useage

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Hello

 

Question regarding what vcenter reports as guest memory % vs what the actual guest is using.  We have a fair amount of linux boxes with varying amounts of memory, 2,3 and 4GB.  What I see when running TOP vs what vcenter reports are not always in line.

 

IE one machine with 4GB:

 

                            total            used            free     shared    buffers     cached
Mem:                     4147992    3635248     512744          0     258916     544848
-/+ buffers/cache:    2831484    1316508
Swap:                    2096440          0         2096440

 

Vcenter is reporting 58% memory useage which I think should be higher based on the numbers above.

 

Therefore can anyone explain to me how vcenter determines that %?  Also if its a viable metric?  IE when vcenter reports only so much (or little) memory and the guest is unresponsive slow and showing higher memory useage what would cause that?

 

One other thing, under Resource Allocation it is showing almost 99% allocated Host Memory, IE 3.96/4GB.  Under Guest Memory its showing 1.68GB active and that number appears to be identical to the percentage vCenter displays.  So how does it get that number and why is it different than what the actual guest is actively using?

 

TIA


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