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Multi Subnet Clustering. How to configure Heartbeat Network.

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.

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