Correct me if I'm wrong but I think Dan meant target's IPs. So if you have a SAN backend with two IP addresses, you first discover LUNs from first IP address, then discover LUNs from the second IP address, and so on... once you have them all, you just check them and click on "OK" so the same target is added with several IP addresses. You don't need to have one IP address per oVirt server.