Change the number of virtual processors on VM

Hello

I have ESXi 4.0 update1 and a number of virtual machines on it.

As you may know, there is a warning saying "Change in the number of virtual processors after installation of operating system guest can make your virtual machine unstable." When you open the properties of the VM to change hardware settings.

However, I have a few virtual machines that I change the number of viftual UC sometimes (increase and decrease) and haven't noticed any problems.

All my VMs are Microsoft Windows 2003/2008/XPs.

Someone know that changing the number of virtual processors has no negative impact or not?

I appreciate your help.

Depending on the configuration of your operating system, this can be harmful. WIndows not the component of ACPI, which must always be configured as uni or multi processor (windows detects usually it and change automatically, I really don't know the trigger to make it not happen, but sometimes it isn't). Also for example, Linux kernel can be compiled without SMP (multi processor support), in order to have several processors can cause the virtual machine to run slowly.

You may not notice any changes in your virtual machines, and I really think that you are not running on SMP issues. But if you want to check in the Device Manager, you can check if your ACPI is United or multi processor and change it properly.

Marcelo Soares

VMWare Certified Professional 310/410

Master virtualization technology

Globant Argentina

Review the allocation of points for "useful" or "right" answers.

Tags: VMware

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