If all the hosts in a cluster are compatible with the new mode, you can change the EVC mode of an existing EVC cluster. You can raise the EVC mode to expose more CPU features, or lower the EVC mode to hide CPU features and increase compatibility.
To raise the EVC mode from a CPU baseline with fewer features to one with more features, you do not need to turn off any running virtual machines in the cluster. Virtual machines that are running do not have access to the new features available in the new EVC mode until they are powered off and powered back on. A full power cycling is required. Rebooting the guest operating system or suspending and resuming the virtual machine is not sufficient.
To lower the EVC mode from a CPU baseline with more features to one with fewer features, you must first power off any virtual machines in the cluster that are running at a higher EVC mode than the one you intend to enable, and power them back on after the new mode has been enabled.
- You must be connected to a vCenter Server system with the vSphere Client.
If you intend to lower the EVC mode, power off any currently running virtual machines with a higher EVC mode than the one you intend to enable. See Determine EVC Modes for Virtual Machines.
- Display the cluster in the inventory.
- Right-click the cluster and select Edit Settings.
- In the left panel, select VMware EVC.
The dialog box displays the current EVC settings.
- To edit the EVC settings, click Change EVC Mode.
- From the VMware EVC Mode drop-down menu, select the baseline CPU feature set you want to enable for the cluster.
If the selected EVC Mode cannot be selected, the Compatibility pane displays the reason or reasons why, along with the relevant hosts for each reason.
- Click OK to close the EVC Mode dialog box, and click OK to close the cluster settings dialog box.