I am trying to find a best way to size the VMs, I understand the NUMA concept and ideally VM should stay withing same NUMA domain rather then crossing in between.
If the Blade has 2 sockets x 12 cores, i understand the single NUMA domain would be 12 cores or 12 VCPUs? so VM should not be allocated with more then 12 CPUs in order to stay in the same NUMA domain?
in this example it would have 24 cores in total or 48 Logical CPUs if Hypertreading on, does this mean that max VCpus on single ESXI host should ideally be 48 vCPUs (same as Logical CPUs)? that would be ratio 2:1?
Many thanks all for your responses
This is a subject for a protracted discussion and there's no quick one-liner answer. If you want to know more about NUMA and vNUMA, I'd recommend you read the (now free) ebook here as it has all that information and more you'd want to know. As a short answer, always try to follow these guidelines:
I've found these two links to have helpful information
Also if you have money or can claim it back take a look at
Explains NUMA and vm configuration and what can impact it among many other usfull things