Switchover (or failover) is the process of changing roles between the Master and Replica, meaning making the Master server the standby server, and the Replica server the active server.
Switchover can be triggered automatically by Arcserve RHA when it detects that the Master is unavailable (failover). Alternatively, Arcserve RHA can simply alert you to the problem, and then you can manually initiate switchover from the Manager.
During the creation of HA scenario, you define how you want the switchover to be initiated. If you selected in the Switchover and Reverse Replication Initiation page the Initiate Switchover manually option, you need to perform a manual switchover. However, if you selected the Initiate Switchover automatically option, you can still perform a manual switchover, even if the Master is alive. You can initiate switchover when, for example, you want to test your system, or you want to use the Replica server to continue the application service while some form of maintenance is performed on the Master server.
If you choose to initiate switchover automatically, after the Master is considered to be down, Arcserve RHA automatically tries to restore the services and databases on it to their active state. First, Arcserve RHA tries to restart services that it previously checked to be managed. If the services are running, it then tries to mount the databases. If all attempts fail, Arcserve RHA initiates failover. These attempts to restore the services and databases are not performed if the switchover is initiated manually.
Once triggered, whether manually or automatically, the switchover process itself is fully automated.
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