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VMWare, changing CPUs

Posted on 2012-03-12
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Last Modified: 2012-06-27
I have a 2 socket Intel machine with 8 cores per socket

For experimentation purposes, I want to run the most cores as possible on the VM

The Edit Settings of my VM under CPUs has the following CPUs set

Number of virtual sockets:     1

Number of cores per socket:    1

Total number of cores:         1

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How can I set this to configure to push the maximum amount of cores possible to the VM

Does a single vCPU or core have to be left for the hypervisor ?
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Question by:Los Angeles1
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14 Comments
 
LVL 123
ID: 37710860
The Maximum number of vCPUs you can add to a VM, is dependant upon your license.

The Max could be 8 CPUs.

But you need to make sure your host OS is licensed to support those CPUs.
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LVL 123
ID: 37710875
See here for Processor Guides in Windows OS

http://support.microsoft.com/kb/888732
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LVL 123
ID: 37710878
What vSphere license do you have?
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LVL 123
ID: 37710883
the maximum number of CPUs you will be able to allocate based on licensing is 8. Unless you have Enterprise Plus, and you could allocate 32.
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Author Comment

by:Los Angeles1
ID: 37710933
So if I get the Enterprise plus, Could I assign 16 cores, or would I have to save one for the Hypervisor
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LVL 123
ID: 37710940
you could assign 32 CPUs to a VM.

But you still need to have the correct Windows license, for Windows to be able to use them all, otherwise the processors will NOT be used.
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LVL 123
ID: 37710946
the hypervisor reserves processor usage for itself. so you will be able to allocate all.
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Author Comment

by:Los Angeles1
ID: 37710977
you could assign 32 CPUs to a VM.

Open in new window


So On a 16 core machine, I can allocate 32 vCPU

Is that because Intel is double threaded?
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LVL 123
ID: 37710998
that would depend on how many physical cores, physical processors, hyperthreading you havevavailable on the physical host.
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Author Comment

by:Los Angeles1
ID: 37711014
On a 2 socket, 16 core (8 core per socket)  machine with Hyper-threading enabled, how many vCPU's can I allocate
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LVL 123
ID: 37711035
in the summary page what does it state?

?? x CPUs?

and does your VM Guest OS support 32 processors?
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Author Comment

by:Los Angeles1
ID: 37711074
The Host summary says I have 16 CPUS, and the guest OS (RHEL) can support 16 or 32 Cores)

So does that mean the most I can assign to this machine is 16 vCPU (or can I assign 32 since the cores are double threaded)
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LVL 123
ID: 37711092
16 vCPUs
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LVL 123

Accepted Solution

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Andrew Hancock (VMware vExpert / EE MVE^2) earned 2000 total points
ID: 37711098
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