Failover
In this section the working of Failover process is explained in detailed.
- Failover is a process in which the original VM in the source host is replaced by the replica VM in the target host in case of disaster.The replica VM is ‘reverted and powered-on’ to the selected restore point.
- The changes done while the replica machine is in failover state will not be committed unless a permanent failover is done.
Note: When the replica machine is in a failover state,the replication job for the particular source machine will not proceed temporarily unless the replica machine is returned to the normal state.
We recommend configuring the NW configuration for the replica machine to be mapped with the source machine if the production site and the DR site come under the same network.
Once you have performed the Failover process, you can finalize the Failover process. This option helps you finalize the failover process and let you decide whether to:
- Revert to Source VM immediately - Undo Failover
- Completely switch from Source VM to replica VM - Permanent Failover
- Rollback to the Source VM after a considerable amount of work done by the replica - Failback
The working of the Failover process is explained with the help of an architecture diagram
Undo Failover
- The replica VM will be reverted back back to its normal state from the failover state. The changes that are done to the replica VM while the machine was in the failover state will be discarded.
- The replica VM will be be reverted back to the last successful replica restore point and the machine will be powered-off.
- The replication job for the source VM will resume as per the schedule.
- Read here for more - Undo Failover
The working of the Undo Failover process is explained with the help of an architecture diagram
Permanent Failover
- Permanent failover is a process in which the original source VM is entirely replaced by the replica VM in the DR site permanently. When the permanent failover is done, the source VM will be removed from its corresponding replication job and no further data will be written to the replica VM.
- The changes done to the replica VM when the machine was in the failover state will committed into the new snapshot in the snapshot chain. All the previous snapshots will be removed from the snapshot chain except the permanent failover snapshot.
The working of the Permanent Failover process is explained with the help of an architecture diagram
