The basic idea behind having multiple subnets (or multiple vlans) for a connection is to evade a broadcast storms. Broadcast storm on a subnet does not go beyond that particular vlan or subnet. So, in case we had an active connection through one vlan (which suffers a broadcast storm), we can make use the connection through the other vlan.
What is the reason to have 2 subnets within the iSCSI network as per this whitepaper?  [URL]  With previous implementaitons with other vendor SANs we normally just have one iSCSI subnet.  Thanks
Why does EMC recommend 2 iSCSI subnets?