I just want to confirm, Is it safe to modify Exchange Server DAG heartbeat and what is the best practice for this? I did a research and found some stuff but I did not see a Microsoft Docs supporting the claims.
The DAG replication rate depends on the replication traffic.
By default, heartbeat frequency (subnet delay) is 1000ms for both local and remote subnets and when a node misses 5 heartbeats (subnet threshold) another nod within your DAG cluster will initiate a failover.
