When you change the guest operating system type in the virtual machine settings, you change the setting for the guest operating system in the virtual machine's configuration file. To change the guest operating system itself, you must install the new operating system in the virtual machine.

You might change the guest operating system, for example, if you are upgrading the guest operating system installed in the virtual machine.

When you set the guest operating system type for a new virtual machine, vCenter Server chooses configuration defaults based on the guest type. Changing the guest operating system type after the virtual machine is created does not retroactively change those settings. It affects the recommendations and setting ranges offered after the change.

Power off the virtual machine.


Select a virtual machine.

In the virtual machines and templates inventory tree, select a group of virtual machines and select a virtual machine from the list on the right.

Search for a virtual machine and select it from the search results list.


In the VM Hardware panel, click Edit Settings.


Click VM Options.


Click the General Options triangle to show the guest operating system options.


From the Guest OS drop-down menu, select the guest operating system family.


Select a guest operating system version.


If you selected Other (32-bit) or Other (64-bit), enter a name for the operating system in the text box.


Click OK.