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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 118
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 118
ID: 37710875
See here for Processor Guides in Windows OS

http://support.microsoft.com/kb/888732
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LVL 118
ID: 37710878
What vSphere license do you have?
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LVL 118
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 118
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 118
ID: 37710946
the hypervisor reserves processor usage for itself. so you will be able to allocate all.
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If you use NetScaler you will want to see these guides. The NetScaler How To Guides show administrators how to get NetScaler up and configured by providing instructions for common scenarios and some not so common ones.

 

Author Comment

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

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

Is that because Intel is double threaded?
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LVL 118
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 118
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 118
ID: 37711092
16 vCPUs
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LVL 118

Accepted Solution

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Andrew Hancock (VMware vExpert / EE MVE) earned 500 total points
ID: 37711098
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