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.
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.
- In the vSphere Client inventory, right-click the virtual machine and select Edit Settings.
- Click the Options tab and select General Options.
- Select a guest operating system type and version.
- Click OK to save your changes.