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spreadsheet about new vms into the cluster

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Hi guys,

 

Recently, I been studied about metrics of vcenter.

 

So,  my study was about development spreadsheet,

 

the spreadsheet is about, what happen when new vms will be adding into the vsphere cluster.

 

I considered assign the metrics per individual host ESXi, cpu usage, memory consumed, overhead memory in accordance vmware table:

http://pubs.vmware.com/vsphere-4-esx-vcenter/index.jsp#managing_memory_resources/r_overhead_memory_on_virtual_machines.html

 

also I counted the number of vcpus configured for all the vms and I counted the number of vram configured for all vms (this metric I used to understand to the worst case when the vms claim in 100%  of vcpu and memory).

 

 

Ex. Host ESXi 20 cores (2 Physical Processor decacore) with 128 GB ram

In that hosts run 10 vms configured 4 vcpus  and 16 GB vram

total 40 vcpus and 160 GB vram

Ratio 40/20 2Vcpus per 1 Pvcpu and 1,2GB vRam per 1GB Ram

 

 

 

I was read the documentation about cpu sizing wrote by scoot lowe, he mentioned a good ration when run into dell hardware 3 vcpus to 1 pcpu. Another documentation by vmware mentioned 10 vcpus to 1 pcpu. but this is not a context to discuss in this moment.

 

 

 

In configuration of  vCenter metric is realy trust, in example when I create a custom cpu usage by month the peak high, low and average is reflected to reality.

 

 

 

So, I would like to understand, What are the way to mensure a impact to new vms or  put more memory or cpu in  VM exist.

 

 

 

What are the way I must analyze: the sum of resource of cluster or the sum of resource per individual host into the cluster


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