if you are trying to set “Enhanced vMotion capabilities” (EVC) on a running cluster, you may see a pop up Error Window saying:
“… Powered-on or suspended Virtual machines on the host may be using cpu feature hidden by that mode”
You can create a new cluster in vSphere and set the EVC on it first with no hypervisor, and then move the nodes and Vms from the old cluster to the new cluster. Please follow the link “Unable to Set Enhanced vMotion Capability (EVC) on a Newly-created Cluster” for detailed instructions.
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