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

[vine0]

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!

[#2 · Accepted solution]

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
http://social.technet.microsoft.com/Forums/en-US/f23ebc4a-f237-4d5d-922c-7549ae54d2e1/dag-replicatio...

More information:

Planning for High Availability and Site Resilience
http://technet.microsoft.com/en-us/library/dd638104(v=exchg.150).aspx#NR

Configure Heartbeat and DNS Settings in a Multi-Site Failover Cluster
http://technet.microsoft.com/en-us/library/dd197562(WS.10).aspx