When the primary companion or machine is prepared to resume operation, the user with the ha_role performs a failback to return the servers to normal companion mode. Because failback temporarily shuts down the databases of the failed-over companion, you should choose a time for the failback when the application load is light. If you choose a time when the Adaptive Server is very busy, failback succeeds, but it is very slow, and the performance of the secondary companion is sacrificed. Choosing the appropriate time for failback can dramatically reduce the amount of time the clients have to wait to reconnect.
