Fix Exchange DAG Failovers Caused by Snapshots

July 3rd, 2012 Posted in Exchange, Virtualization

By changing the following thresholds you can likely prevent unexpected failover of the DAG.
cluster.exe /prop SameSubnetDelay=2000:DWORD
cluster.exe /prop CrossSubnetDelay=4000:DWORD
cluster.exe /prop CrossSubnetThreshold=10:DWORD
cluster.exe /prop SameSubnetThreshold=10:DWORD

To change back to the defaults…
cluster.exe /prop SameSubnetDelay=1000:DWORD
cluster.exe /prop CrossSubnetDelay=1000:DWORD
cluster.exe /prop CrossSubnetThreshold=5:DWORD
cluster.exe /prop SameSubnetThreshold=5:DWORD

To view your current settings.
cluster.exe /prop

  1. 2 Responses to “Fix Exchange DAG Failovers Caused by Snapshots”

  2. By Carlos Rotver on Jul 4, 2013


    Question: If I run these commands, Can a Failover occur?? Are these danger free?? =)


  3. By cpfarhood on Aug 28, 2013

    Yes! It works as expected.

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