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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?
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SeeDk
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SeeDk
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Andrew Hancock (VMware vExpert / EE MVE^2)VMware and Virtualization ConsultantCommented:
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.

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.
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SeeDkAuthor Commented:
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?

Capture.JPG
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Andrew Hancock (VMware vExpert / EE MVE^2)VMware and Virtualization ConsultantCommented:
Logical Processors states - 64 ?

So it does see 64 Logical Processors.
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Lee W, MVPTechnology and Business Process AdvisorCommented:
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/
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SeeDkAuthor Commented:
@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.
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Andrew Hancock (VMware vExpert / EE MVE^2)VMware and Virtualization ConsultantCommented:
You previosuly stated..

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.

What is the hardware version of the VM you are using ?

Virtual Machine version 8.0  has a max of 32 vCPUs!

version 9 and 10 changed this to 64, create a VM using the Web Client, or later version of vSphere Client. (which is now not supported end of life)
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SeeDkAuthor Commented:
Ah, that would be it then! Yes, the Machine version is 8.0. I'll create a newer one and check.
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SeeDkAuthor Commented:
That was it. Andrew the MASTER of VMware cuts right into the root issue again!
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Andrew Hancock (VMware vExpert / EE MVE^2)VMware and Virtualization ConsultantCommented:
Thanks..
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