Wondering if I can get a little help on VM sizing. I have read lots and lots of articles and believe I am close to what I want but would like to go over this with someone knowledgeable.
2 esxi servers, 8 sockets, 24 cores/socket @3Ghz with Hyperthreading and 3TB RAM
Results in 768 vCores in the cluster with 6TB RAM and NetApp storage up to 21TB total
So, from my reading, my NUMA cores are 24 vCPU's and memory is really not a concern, neither is HDD for us
Lightweight VM:
2 CPU, reservation 3GHz, Limit 3Ghz, Mem 4GB
The 3GHz limit comes from the math above, 2CPU*1.5Ghz (hyperthreaded clock rate)
This seems to be working fine, all is well, no issues
Heavy VM:
24CPU, reservation 36Ghz, Limit 36Ghz, Mem 96GB
This also works fine, however.
In the 'New View' for the VM itself:
Capacity and usage:
35Ghz, 10GB Mem, 52GB HDD
VM Hardware:
CPU 24 CPU, 51Ghz used
Why is this number so much different from the capacity and usage. Also, comparing to the lightweight VM, on which the capacity and usage and VM hardware match. Also, If I add more CPU, say 72, triple what I've got, the readout simply says 120Ghz. In other words, it always uses 20%-ish more than the limit no matter how many resources I throw at it.
Anyone one have anything on this basic system design question?