VM oversized

Dear guys,

I want to set another example of a monster VM with full booking and its behavior to an overload of interchangeable terms.

I still have my VM with 512 GB of RAM and 32vCPU Monster.

Provider of applications require a memory reservation is why we assigned the reserved memory.

Of course, it cannot start, but the condition remains until I reduce the reserve of 100 GB at least.

The end to start the virtual machine, so I need to book only 420 GB instead of 512.

When I check the memory load is 117 GB...

The host is 512 GB of physical ram + 20 vCPU.

I read a lot of articles, including some on VMS oversized that can lead to reduced performance, but I can not find something to justify my client why "let go us" 100 GB of RAM overhead.

Any suggestion?

Thank you very much

Daniele

Yes, it's okay... The more memory and vCpu has your VM, more the overhead of memory will be...

See page 30 of this document for more information: http://pubs.vmware.com/vsphere-50/topic/com.vmware.ICbase/PDF/vsphere-esxi-vcenter-server-50-resource-management-guide.pdf

Or these blog posts:

http://frankdenneman.nl/memory/virtual-machine-memory-overhead/

http://simongreaves.co.uk/blog/virtual-machine-memory-overhead

Tags: VMware

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