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Re: Guest VM shows 90% memory usage, doesn't match vSphere

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Under 2008+, true memory free = cache + free.  So in your case, the 4GB VM is using 3GB with 1GB truely free.

 

The memory stats seens in vCenter reflect active memory access.  That is, the hypervisor knows when a VM is accessing memory and can report on the amount of memory that's "active" in this regard.  But it cannot report on how much memory the GuestOS consider to be consumed/free.

 

You're basically reviewing 2 completely different stats that will not line up because they are reporting on different things. 

 

Pretend I'm an operating system with running applications that collectively conumes 2GB of RAM, but I only actively/regularly access data stored in 10% of that 2GB allocated/consumed.  So one stat will tell you I'm using 2GB of RAM, whereas the other will tell you I'm only actively/regularly using 10% of it.


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