However, iDRAC6 uses a different prompt, so the '-c' parameter needs to be passed. The new PowerEdge non-blade servers are called iDRAC6, and respond to the new iDRAC interface, as well as the old DRAC5 style of 'racadm' commands.
It is possible that a customer might want to use the CMC as the primary fencing method, and the iDRAC as a secondary method. These are configurable on the new blade servers and can be manipulated directly instead of via the Dell CMC. Dell's new servers use an 'iDRAC' that has an entirely new interface to it.