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Titre
When a cluster member will be offline for several hours or days, what considerations should be made? -
Description
If a cluster member is moved between sites or has an extended downtime due to construction or something else, what are best practices? -
Cause
If the affected cluster member is still joined to the cluster when offline for an extended period and then brought back online, it can introduce a split-brain scenario.
A split-brain scenario is where a cluster gets divided into smaller clusters. Each of these smaller clusters believes it is the only active cluster and may then access the same data which could lead to data corruption.
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Résolution
Moving a Replica:
- Follow the instructions Unjoin Cluster Members from KB 252260
- Once the move is completed, follow the instructions Enroll Cluster Members from KB 252260
Moving a Primary:- Follow the instructions failing over to a replica by promoting it to be the new primary from the Administration Guide.
- Unjoin the original primary with the instructions Unjoin Cluster Members from KB 252260
- Once the move is completed, to enroll the primary follow the instructions Enroll Cluster Members from KB 252260
- Promote the intended primary back to the primary with these instructions failing over to a replica by promoting it to be the new primary from the Administration Guide.
- The temporary primary will return to a replica state after successful completion.