You can restore a malfunctioning primary instance by promoting a replica instance to become the primary instance.
Promoting a replica instance restores the primary instance more quickly than replacing the primaryinstance with a new appliance, but the replica instance available for promotion needs to be physically accessible to an Operations Console administrator to facilitate ongoing administration.
Promoting a replica instance to be the primary instance changes the topology of a deployment in the following ways:
The malfunctioning primary instance is deleted from the deployment.
The promoted replica instance becomes the new primary instance.
The RADIUS server on the new primary instance becomes the RADIUS primary. You cannot perform a separate promotion of a replica RADIUS server.
If web tiers are associated with the old primary instance, you must restart the web tiers that are associated with the old primary instance.
If web tiers are associated with any replica instance in the deployment, you must restart the web tiers that are associated with any replica instance.