Team,
We are observing dtabase is getting switch over on passive server automatically. Please help me troubleshooting steps to get the RCA. Why it is happening so ?????
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Team,
We are observing dtabase is getting switch over on passive server automatically. Please help me troubleshooting steps to get the RCA. Why it is happening so ?????
Hi,
please check event viewer on all servers to see what causes the database switch over.
We had same issue and found out reason was because we had issue with our Hyper-V cluster.
If main Exchange server is getting switched over to another cluster,this issue will happen.
This is stated in White paper for Virtual Exchange:
When performing live migration of DAG members, follow these key points:
If the server offline time exceeds five seconds, the DAG node will be evicted from the cluster. Ensure that the hypervisor and host-based clustering use the Live Migration technology in Hyper-V to help migrate resources with no perceived downtime.
If you are raising the heartbeat timeout threshold, perform testing to ensure that migration succeeds within the configured timeout period.
On the Live Migration network, enable jumbo frames on the network interface for each host. In addition, verify that the switch handling network traffic is configured to support jumbo frames.
Hi ,
Just search for the event id 306 on the below mentioned path.
Application and service logs ------>Microsoft--->exchange---->high availability ------->operational
Hi,
Suggestions from S.Nithyanandham are helpful. Please check these suggestions to see if there is any related message about that DAG failover automatically.
And you can also check the application log to see if there is any events about the issue.
The article you provided above can help to monitor DAG.
Best regards,
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