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Failing over virtual workloads in the Double-Take Console

On the Monitor Connections page, select the connection that you want to failover.
In the lower pane, click Failover in the toolbar.
Select the type of failover to perform.

Live failover—Select this option to initiate a full, live failover. This option will shutdown the source virtual machine (if available), stop the protection job, and start the replica virtual machine on the target with full network connectivity. You will only be able to undo a live failover if you are protecting a Hyper-V virtual machine at the host level. If you are protecting an ESX or Hyper-V virtual machine at the guest level, you will not be able to undo a live failover, nor will you be able to reverse or failback.
Test failover—Select this option to perform a test failover without network connectivity. This option will leave the source virtual machine online, suspend the protection job, and start the replica virtual machine on the target without network connectivity. In addition to being able to undo a test failover if you are protecting a Hyper-V virtual machine at the host-level, you can also undo a test failover if you are protecting a Hyper-V or ESX virtual machine at the guest level.

Click Failover to begin failover.

Note: Once failover has occurred, if you add CPUs to the replica of the source on the target, you may have to reboot the replica before the operating system will recognize the additional CPUs.
Depending on your workload type and the type of failover you performed, you can undo it by clicking Undo Failover in the toolbar.

Live failover— You can only undo a live failover if you are protecting a Hyper-V virtual machine at the host level. In this case, the replica virtual machine on the target will be shutdown, the virtual machine on the source will be restarted, and the protection job will be restarted performing a file differences remirror. When you undo a live failover, all changes made on the replica virtual machine on the target will be lost. If you do not want to lose the changes made on the replica virtual machine on the target, perform a restore and failback.
Test failover—In addition to being able to undo a test failover if you are protecting a Hyper-V virtual machine at the host-level, you can also undo a test failover if you are protecting a Hyper-V or ESX virtual machine at the guest level. In this case, the replica virtual machine on the target will be shutdown and the protection job will be restarted performing a file differences remirror.