Failover undo is one of the ways to finalize failover. When you undo failover, you switch back from a replica to the source VM. Veeam Backup & Replication discards all changes made to the replica while it was in the Failover state.
The failover undo operation is performed in the following way:
- Veeam Backup & Replication reverts the replica to its pre-failover state. To do this, Veeam Backup & Replication powers off the replica and gets it back to the latest restore point in the replication chain. Changes that were written to the protective virtual disks (<disk_name>-interim.vmdk) while the replica was in the Failover state are discarded.
- The state of the replica gets back to Ready, and Veeam Backup & Replication resumes replication activities for the source VM on the source host.