During locale update on a CUC cluster, we follow the below procedure so that the database replication is not affected.

If the server that you want to shut down has Primary status, change the status:

a. In the Change Server Status column for the server with Secondary status, click Make Primary.

b. When prompted to confirm changing the server status, click OK.

c. Confirm that the Server Status column indicates that the server now has Primary status and that the server you want to shut down has Secondary status.

But is it required to follow this even for a cluster reboot?