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Virtualization Manager (VMAN)

Forum Guest OS Memory metrics vs. Solarwinds Memory metrics

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Guest OS Memory metrics vs. Solarwinds Memory metrics

inflxx-ec over 12 years ago

So I have noticed something. When I RDP to my guest OS (2008 R2) and I go to Task Manager and check the physical memory is pegged at about 90%. But when I check Solarwinds and check the memory utilization it shows like 20% utilized. Can someone explain to me the difference here and if I should be concerned about this?

Thanks.

0 jonathan.reeve over 12 years ago

Hi there,
In a virtual environment, metrics received from inside the guest can be unreliable for a number of reasons including hypervisor overhead not being taken into account, clock skew and more. This blog post has some detailed explanation http://vpivot.com/2010/02/10/inaccuracy-of-in-guest-performance-counters/
This is why it is extremely important to monitor the hypervisor metrics like Virtualization Manager does.
You also have effects like "Transparent Page Sharing" (TPS) where VMware can reclaim memory across a bunch of VMs running on a host.

Jon
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0 jonathan.reeve over 12 years ago in reply to jonathan.reeve

Memory management in VMware is a complex topic - you can find more details here http://www.vmware.com/files/pdf/perf-vsphere-memory_management.pdf
Jon
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