We've been runing many MD3000i for years on one subnet for different clients. At the beginning, we were running the MD3000i on 2 subnets on ESX 3.5 But we got into a problem when we decided to test the failover. Dell even sent an engineer after days on testing. They were working with Vmware on this case. It lasted for weeks.
As a result they told us - as well as vmware - to use only one subnet.
But every article and white papers I read about the MD3000i are refering to 2 subnets.
The big question: 1 or 2 subnets ? And why ?