SeeDk
asked on
ESXI 5.5: logical processors and vCPU question
I have a server with two sockets and 16 cores per socket. This means 32 physical cores.
With HT enabled, ESXI should see 64 logical processors.
This does match what I see in the vSphere client.
But when I create a VM the maximum amount of vCPUs I can select is 32!
I thought that with 64 logical processors I could allocate 64vCPU to a VM (or 40 or 50)?
Why is it not allowing me to go over 32?
With HT enabled, ESXI should see 64 logical processors.
This does match what I see in the vSphere client.
But when I create a VM the maximum amount of vCPUs I can select is 32!
I thought that with 64 logical processors I could allocate 64vCPU to a VM (or 40 or 50)?
Why is it not allowing me to go over 32?
ASKER
Says enabled but I will double check in BIOS. ESXI build is 2068190. I haven't checked the firmware - anything in particular i should look for?
Logical Processors states - 64 ?
So it does see 64 Logical Processors.
So it does see 64 Logical Processors.
Two things, (I'm not a VM Ware guy) - is it possible the VM was created in ESXi 5.0 and retains that limit of 32 CPU unless you upgrade it somehow?
You DO NOT want to use that many CPUs - your performance will likely be horrible, especially if there are other VMs on this system.
See:
http://www.zdnet.com/article/virtual-cpus-the-overprovisioning-penalty-of-vcpu-to-pcpu-ratios/
You DO NOT want to use that many CPUs - your performance will likely be horrible, especially if there are other VMs on this system.
See:
http://www.zdnet.com/article/virtual-cpus-the-overprovisioning-penalty-of-vcpu-to-pcpu-ratios/
ASKER
@Andrew
Yes, that looks fine and I also confirmed in BIOS that it is set to enabled. But when i create a new VM I can't select over 32vCPU.
@Lee
This is a brand new VM, I'm not copying anything over. There will be only 2-4 VMs on this host.
Yes, that looks fine and I also confirmed in BIOS that it is set to enabled. But when i create a new VM I can't select over 32vCPU.
@Lee
This is a brand new VM, I'm not copying anything over. There will be only 2-4 VMs on this host.
ASKER CERTIFIED SOLUTION
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ASKER
Ah, that would be it then! Yes, the Machine version is 8.0. I'll create a newer one and check.
ASKER
That was it. Andrew the MASTER of VMware cuts right into the root issue again!
That is correct.
Processor Sockets 2
Cores per Socket 16
32 CPUs
Hyperthreading - Active
Should show - 64 Logical Processors ?
Any chance of a screenshot?
What is the server, is Hyperthreading Enabled ? in the BIOS
What build of ESXi 5.5 ?
Have you updated all the firmware on the host server.