If a primary VM in the production site becomes unavailable, you can quickly restore services by failing over to its replica. When you perform failover, the VM replica takes over the role of the original VM: you switch from the production VM to its replica and shift your processes from the production host to a secondary host. As a result, you have your VM up and running within a couple of minutes, and your users can access services and applications they need with minimal disruption.
In Veeam Backup & Replication, you can fail over to the latest state of a replica or to any of its valid restore points.
Failover itself is an intermediate step that needs to be finalized. Depending on a disaster recovery scenario, you can do one of the following:
- Perform permanent failover. When you perform permanent failover, you 'commit failover'. That is, you permanently switch from the original VM to a VM replica and use this replica as the original VM. This scenario is acceptable if the original VM and a VM replica are located in the same site and are nearly equal in terms of resources. In this case, your users will not experience any latency in ongoing operations.
- Perform failback. When you perform failback, you 'return' from a VM replica to the original VM after the problem in the production site is eliminated. All changes that took place while the VM replica was running are transferred to the original VM. You can follow this scenario if your VM replica is located in a DR site and is running on a lower tier host and storage: that is, it is not intended for continuous operations.
- Undo failover. When you undo failover, you switch back to the original VM and work with it in the normal operation mode. All changes made to the VM replica are discarded. You can follow this scenario if you plan to perform some testing and troubleshooting of your VM replica and do not want to affect your production environment in any way.
Veeam Backup & Replication supports failover and failback operations for one VM and for a number of VMs. This way, if you have a problem with an ESX(i) host, you can restore its work with minimum downtime.
When you fail over from a running original VM to a VM replica, Veeam Backup & Replication does not power off the original VM, it simply powers on the VM replica.
The failover option can be used with any VM replica that was successfully created at least once. Open the Home view, and select the Replicas node in the inventory pane. Check if there is at least one restore point available for the replicated VM.
To fail over to a VM replica:
- Open the Home view.
- In the inventory pane, select the Replicas node.
- Right-click the replicated VM and select Failover Now to launch the VMware Failover Wizard.
- If you want to fail over to a specific restore point, at the Virtual Machines step of the wizard, select the VM in the list, click Point and choose the restore point to which you want to fail over.
- At the Reason step of the wizard, specify the reason for future reference.
- At the last step of the wizard, click Finish to fail over to a VM replica.
- Open the Home view.
- Select the Replicas node in the inventory pane.
- Make sure that the replicated VM is in the Failover state.
- Open the vSphere Client and make sure that the VM replica is powered on.