VMware Removing 2 x vCPU (4 vCPU to 2v CPU)

3lijah
3lijah used Ask the Experts™
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hello,

i would like to know the best way to remove 2 x vCPUs on VMware with windows 2003 server (currently there are 4 x vCPUs).

so what i understand is that you need to turn off and edit settings and reduce the server count, but not too sure how to change to HAL in windows, or if this needs to be changed as this is still a multi processor.

i have been unable to test as all CPUs are in use.

thanks in advance!


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StappmeyerInfrastructure Architect

Commented:
If you are leaving it at 2vCPU, you do not need to change the HAL.
-Steve
StappmeyerInfrastructure Architect

Commented:
Here is some additional information if you take the server to a single CPU.  In short, once you are on a multiprocessor hal, you will stay there.

http://support.microsoft.com/kb/811366

Author

Commented:
So reducing the vCPU count to 2 should not affect anything, regardless if the vServer was was set up with 4?

what does this warning refer to? (in vmware / edit settings / CPUs):
-------
Warning: Changing the number of virtual processors after the guest OS is installed may make your Virtual Machine unstable.
-------

Regards,
Infrastructure Architect
Commented:
That is a standard warning.  In a physical or virtual system, any changes to CPU or memory could cause issues.  That said, I personally change virtual CPU counts for diagnostics, performance, and etc on a routine basis.  

Windows 2000 was more temperamental.  Working with 2003/2008, you should be ok.

Steve

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