After a switchover was initiated, whether manually or automatically, at some point you will want to reverse back the server roles, and make the original Master the active server again and the Replica the standby server. Before you switch back the roles between them, if you want the data on the active server, meaning the original Replica, to overwrite the data on the standby server, you need to run a reverse scenario (also called "backward scenario").
During the creation of the HA scenario, you defined how you want the reverse scenario to be initiated. If you selected the Initiate Reverse Replication automatically option, replication in the reverse direction (from Replica to Master) automatically begins after a switchover, once the original Master will become available. However, if you selected the Initiate Reverse Replication manually option, you need to perform a manual switchback. If the manual option is selected and you will not initiate a manual switchback, a resynchronization of the data from Replica to Master will have to be performed, even after a test of clean switchover without an actual Master failure.
Note: After a switchover, in certain circumstances you may want to switch the Master and Replica roles without overwriting the original Master data with the Replica data. To perform this, use the Recover Active Server option.
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