I am trying to enable EVC mode on a cluster but get the message "The host cannot be admitted to the cluster's current Enhanced vMotion Compatibily mode. Powered-on or suspended virtual machines on the host may be using CPU features hidden by the mode.".
The cluster originally had 2 Dell PowerEdge R810 servers with dual Intel Xeon E7540 cpu's. I'm trying to add 2 older Dell PowerEdge R900 servers that have quad Intel Xeon E7320 cpu's. I'm guessing it won't let me enable it because the powered on virtual machines are using the newer servers (R810) and their cpu's. Is my guess correct? Do I have to power off all of my VM's in order to enable EVC or is there another way to enable it?