How to know when to Stop putting VMs on ESXi Hosts based on CPU usage

[SamiEMC]

Hi

we have a Cluster with 5 ESXi's

Each is

Available   CPU	# core	Logical   proccessor
4	8	64
4	8	64
4	10	80

and other 2 ESXi's are same as last

most vms use 2 vCPUs and few have 2*2 vCPUs but in general CPU usage isnt high for the different VMs

so from CPU Point of View

how to know when to stop having more vms on the ESXi's in general ?

Thanks

Sami

[SamiEMC]

any clues ?

[lenzker]

keep a look at the cpu ready value of your vCPU's. Once it reaches a threshold of 10% (2000ms in vCenter performance chart - real-time) your vCPU to pCPU consolidation rate is far too high.

Of course it all depends on your requirements in your applications / SLAs.

ready is a good indicator, since it reflects the "processing-latency" of your virtual machine. There are a lot of articles explaining this

e.g. http://vmfaq.com/entry/42/

[Kahonu84]

My experience tells me you're going to run into memory issues waaaaaay before CPU.