Hi Sam, Sorry for the delay, I was trying a few things and managed to resolve the issue. The SAN comes with default subnet masks of 255.255.255.0 on all iSCSI ports, but I had set my Host NICs to have subnet masks of 255.255.254.0. Once I changed the SAN subnet masks to 255.255.254.0 I could ping all 4 ports on the channel from the host. Many thanks for helping me with this issue.
Hi, I am in the process of setting up a MD3220i SAN unit. I am using the default IP addresses for each of the iSCSI ports on both Controller 0 and Controller 1. i have setup my host (Hyper-V Server 2008 R2) and I am using 2 NICs on this host for SAN traffic, the IP Addresses that I have assigned are 192.168.130.3  (255.255.254.0) and 192.168.132.3 (255.255.254.0) Each NIC is connected through a separate switch to the SAN. when I ping each of the 4 SAN ip addresses, only 2 will reply, these are 192.168.130.101 and 192.168.132.101.  Why do the other two IP addresses (192.168.131.101 and 192.168.133.101) no respond to the ping request. All subnet masks on the SAN ports are 255.255.255.0 Thanks for your help   
Ping error on MD3220i