Failover is performed in the following way: VBR rolls back the VM replica to the required restore point, powers on the VM replica, temporarily puts replication activities for the original VM on hold (until the VM replica is returned to the Normal state) and as the last step all changes made to the VM replica while it is running in the Failover state are written to the delta file of the snapshot, or restore point, to which you have selected to roll back.
When you start the planned failover, VBR performs the following steps:
1. The failover process triggers the replication job to perform an incremental backup and copy the un-replicated changes to the replica.
2. The VM is powered off.
3. The failover process triggers the replication job to perform another incremental backup run and copy the portion of last-minute changes to the replica. The replica becomes fully synchronized with the source VM.
4. The VM is failed over to its replica.
5. The VM replica is powered on.
Note that it is recommended that you always use Veeam Backup & Replication to perform failover operations. Avoid powering on a replica manually — this may disrupt further replication operations or cause loss of important data.
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