After a successful takeover operation, the secondary cluster becomes the primary for the protection group and the services are online on the secondary cluster. After the recovery of the original primary cluster the services can be brought online again on the original primary by using a process called failback.
The Geographic Edition framework supports the following kinds of failback:
Failback-switchover. During a failback-switchover, applications are brought online again on the original primary cluster after the data of the original primary cluster was resynchronized with the data on the secondary cluster.
Failback-takeover. During a failback-takeover, applications are brought online again on the original primary cluster and use the current data on the original primary cluster. Any updates that occurred on the secondary cluster while it was acting as primary are discarded.
If you want to leave the new primary as the primary cluster and the original primary cluster as the secondary after the original primary restarts, you can resynchronize and revalidate the protection group configuration without performing a switchover or takeover.
For procedures to perform a failback-switchover or a failback-takeover, see the Geographic Edition documentation for the data replication product you are using.