For anyone that might stumble on a Cisco UCS C220 M4S and wondering how to configure power management. below are the steps to configure it, as it took me some hours to figure it out...

1. enable IPMI on server. (Cisco has this documented)

2. at ovirt GUI, edit host -> power management, then select "ipmilan" and add lanplus=1 as an option. (the bold one was the tricky part)

To test from command line:

 ipmitool -I lanplus -H <your IP> -U admin -P somepass -v chassis power status

It will give the response: "Chassis Power is on"

Alex