vCPU Capacity Planning for ESXi Hosts

[Shivaprabhu]

Hi Folks,

I am working on ESXi hosts capacity planning and would like to understand vCPU capacity for each ESXi Hosts,

ESXi Hosts Config:

Physical CPU Socket: 2 x 2.7 GHz

Cores Per CPU:  8

Total CPU Cores: 16

Logical Processors: Disabled

RAM: 64 GB

How many VMs we can create with 2 vCPU each (not setting any CPU reservation) ?

Appreciate your quick response on this...

Thanks 

[daphnissov]

The answer is always "it depends" when it comes to these questions. Without knowing workload patterns, KPIs for performance success criteria, and other details, we can only say without over subscription that you can create 8 x 2 vCPU VMs per host.

[Shivaprabhu]

Thanks for the quick reply. In this case can we create couple of VMs with total number of 64 vCPU's which crosses the total CPU cores 16.

Consider an example, Can we create 16 VMs with each 4 vCPU (The total vCPUs will be 64 vCPU's which is more than actual Physical 16 Cores) ?

It would be grate if share me the vCPU capacity planning for ESXi hosts.

[daphnissov · Accepted solution]

Yes, you could create 4 x 16 vCPU VMs, which would put your subscription rate at 4:1. Depending on your workloads, this may run OK for you, or you could see high co-stop values which present performance problems.

[Shivaprabhu]

Thanks a lot for the quick response.