Exchange Server DAG heartbeat modification safe and what's the best practice for it?

Regular Visitor

Hi Experts,


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.


Thanks in advance!

1 Reply
best response confirmed by vine0 (Regular Visitor)
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.

A related thread for your reference.

DAG Replication Bandwidth

More information:

Planning for High Availability and Site Resilience

Configure Heartbeat and DNS Settings in a Multi-Site Failover Cluster