We are setting up SQL AlwaysOn Availability group so windows failover cluster is needed as pre req. The nodes are in Prod and DR DC. 2 nodes in Prod and 2 in DR, so it will be a 4 node cluster. Because the IP subnet is different in Prod and Dr, we will end up getting a multi subnet cluster.
The question is more on the Heartbeat network. Is it required to have the HB IP for all 4 nodes in the same subnet ? Or can have Heartbeat IP for 2 nodes (Prod) in one subnet and other for other 2 nodes in other.
Thanks.