SPPallows the Appliance Administrator to unjoin replica appliances from a cluster. Prior to unjoining a replica from a SPP cluster, review the unjoin considerations that follow.
Considerations to unjoin cluster members
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You can only unjoin replica appliances from a cluster.
- To promote a replica to be the new primary and then unjoin the 'old' primary appliance, you can use the Failover option if the cluster has consensus (the majority of the appliances are online and able to communicate). For more information, see Failing over to a replica by promoting it to be the new primary. If the cluster does not have consensus, use the Cluster Reset option to rebuild your cluster. For more information, see Resetting a cluster that has lost consensus.
- To perform an unjoin operation, the replica appliance to be unjoined can be in any state; however, the remaining appliances in the cluster must achieve consensus (online and able to communicate).
- You can unjoin a replica appliance when logged in to any appliance in the cluster that is online, using an account with Appliance Administrator permissions.
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When you unjoin a replica appliance from a cluster, the appliance is removed from the cluster as a stand-alone appliance that retains all of the data and security policy configuration information it contained prior to being unjoined. After the replica is unjoined, the appliance is placed in a Read-only mode with the functionality identified in Read-only mode functionality. You can activate an appliance in Read-only mode so you can add, delete and modify data, apply access request workflow, and so on. For more information, see Activating a read-only appliance.
To unjoin a replica from a cluster
- Log in to an appliance in the cluster, as an Appliance Administrator.
- Go to Cluster Management:
web client: Navigate to
Cluster > Cluster Management.
- In the cluster view on the left, select the replica node to be unjoined from the cluster.
- In the details view on the right, click
Unjoin.
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In the Unjoin confirmation dialog, enter the word Unjoin and click OK to proceed.
SPP displays
(synchronizing icon) and
(lock icon) next to the appliance it is unjoining and puts the replica appliance in Maintenance mode while it is unjoining from the cluster.
Once the operation has completed, the replica appliance no longer appears.
Login during Maintenance mode
If you log in to the replica appliance while SPP is processing an unjoin operation, you will see the Maintenance mode screen. At the end of the Maintenance mode, there will be a button indicating that the unjoin operation completed successfully: