Determining how much to overcommit vcpu and memory??

REIUSA
REIUSA used Ask the Experts™
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What do you find is a good number to look for in vcpu:cpu and vram:ram ratios? Or is it more determined by what kind of demand there is with the current ratios?

Trying to find some guide lines of best practices to follow for determining when you are getting over allocated on CPU and RAM.

Also what VM:host ratio do you find is a good number?
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VMware and Virtualization Consultant
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Commented:
It is based on workload and demand, actively monitoring your hardware, using reports, Capacity Monitoring and What If Reports.

Over many years, We work on 5-6 vCPU per core, and 8GB per Core in the host,
Lee W, MVPTechnology and Business Process Advisor
Most Valuable Expert 2013
Commented:
As far as I know, this is still a serious potential problem - http://www.zdnet.com/article/virtual-cpus-the-overprovisioning-penalty-of-vcpu-to-pcpu-ratios/

Bottom line, DON'T over-commit CPU.  I start with 2 vCPU and increase only if necessary.

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