I have a 4 node cluster. Server A1, Server A2 in one location and B1 and B2 in second location. They are windows failover clusters.Cloud witness is configured. There are two instances in first location.first instance in A1 and second instance in A2.Their corresponding AG replica instances are in B1 and B2. For first instance i have set prefered owner as A1 and A2.(B1 and B2 in second location is unchecked)
OS Version-SQL 2016 Ent
Windows-2016 STD.
When there was a network flapbetween two locations,below events are triggered.
- Microsoft Failover Cluster Virtual Adapter (NetFT) has missed more than 40 percent of consecutive heartbeats.
- Cluster has lost the UDP connection from local endpoint
- Group 'Cluster Group' has transitioned from state 'Online' to state 'Orphaned'.
- Clustered role 'Cluster Group' is moving from cluster node 'A1' to cluster node 'A2'.
- Cluster has established a UDP connection from local endpoint
- Clustered role 'First Instance' is moving from cluster node 'B1' to cluster node 'A1'.(Since preferred owner for first instance is set to A1 AND A2 WHY IS FIRST INSTANCE IS SHOWING MOVING FROM B1 TO A1
once reconncted i saw both first and second instance in A2.
Can you tell me any weblinks to understand the sequence of events post a network disconnection in cluster and why in the event its showing moving from B1 to A1.
Manual failover is configured..
Best Regards, ACDBA http://whynotsql.blogspot.com/