Hi Peter, It needs to be one subnet per VLAN. VLT should allow the switches to more or less be treated as a single switch in the configuration. Page 677 [URL]  
Hello,    I have 2 Dell S4128 Switches that are interconnected via VLT. We use these switches with our servers and they are top of the rack switches for me,   Dell SC  documents states that switches do not need to be Interconnected, and that the fault domains need to be in a different subnet. I would like to keep my switch structure as it is - redundant and appear as one. How can I accomplish the different subnets for the two fault domains? Do the two subnets for the two Fault domains need to be on the same vlan?   Thank you and any help is appreciated. Peter      
SCv3020 2 fault Domains and 2 Interconnected S4128 Switches