How to retrieve Memory Overhead for a VM?

[marc045]

Hi All,

In vSphere Client > Select a VM > Summary tab, under General, shows:

Guest OS: Windows XP

VM Version: 7

CPU: 1 vCPU

Memory: 1024 MB

Memory Overhead 103.58 MB

With PowerCLI, how do I retrieve this "103.58" figure for VM "vm123" ?

Regards

marc0

[RvdNieuwendijk · Accepted solution]

You can get the memory overhead of all your VM's with:

Get-VM | Select Name,@{N="MemoryOverhead";E={$_.ExtensionData.Runtime.MemoryOverhead/1MB}}

Regards, Robert

[AlbertWT]

What is that overhead used for ?

[DSTAVERT]

It is the memory that the host uses to service the guest. Page tables etc.

http://www.vmware.com/files/pdf/perf-vsphere-memory_management.pdf

[AlbertWT]

ah OK, many thanks man !

so the larger the vRAM in a VM the larger the overhead size ?