How can I configure loadbalance to operate as a failover?
I don't really want to loadbalance the real servers. I want one to be the "primary" unless it fails (probe dies) then it will move connections to the other real server.
You would need to configure the real meant to receive all the connections until it fails in the primary serverfarm, then add the second server to a backup serverfarm. If the server in the primary serverfarm goes offline for some reason the ACE will send connections to the server in the backup serverfarm.