I've got a solution in place where I have two HP Proliant servers with 8 ports each installed. I have an iSCSI backend to for the data store. I've got the network configured the best way I can glean ...
iSCSI traffic is on a separate isolated VLAN. 3 servers with dual quad-port gigabit NICs. Each set of 4 ports would be on different cards, so the teams would have 1 connection on each card.