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Understanding Failover And Failback

AppAssure supports failover and failback in replicated environments, in case of a severe outage in which

the source core and agents fail. Failover refers to switching to a redundant or standby target (AppAssure

Core) upon system failure or abnormal termination of a source core and associated agents. The main

goal of failover is to launch a new agent identical to the failed agent. The secondary goal is to switch the

target core into a new mode so that the target core protects the failover agent in the same way as the

source core protected the initial agent before the failure. The target core can recover instances from

replicated agents and immediately commence protection on the failed-over machines.

Failback is the process of restoring an agent and core back to their original states (before failure). The

primary goal of failback is to restore the agent (in most cases, this is a new machine replacing a failed

agent) to a state identical to the latest state of the new, temporary agent. When restored, it is protected

by a restored source core. Replication is also restored, and the target core acts as a replication target

again.

Performing Failover

When you encounter a disaster situation in which your source core and associated agents have failed,

you can enable failover in AppAssure to switch protection to your identical failover (target) core. The

target core becomes the only core protecting the data in your environment, and you then launch a new

agent to temporarily replace the failed agent.

To perform failover on the target core:

1. Navigate to the Core Console on the target core, and click the Replication tab.

2. Under Incoming Replication, select the source core, and then expand the details under the

individual agent.

3. On the Actions menu for that core, click Failover.

The Fail Over dialog box appears and lists the next steps required for completing a failover.

4. Click Continue.

5. In the left navigation area, under Protected Machines, select the machine that has the associated

AppAssure agent with recovery points.

6. Export the backup recovery point information on that agent to a virtual machine.

7. Export the backup recovery point information on that agent to a virtual machine.

8. Start the virtual machine that now includes the exported backup information.

You need to wait for the device driver software to be installed.

9. Reboot the virtual machine and wait for the agent service to start.

10. Go back to the Core Console for the target core and verify that the new agent is displayed under

Protected Machines and on the Replication tab under Incoming Replication.

11. Force multiple snapshots, and verify they complete correctly.

For more information, see Forcing a Snapshot.

12. You can now proceed with performing failback.

For more information, see Performing Failback.

Performing Failback

After you repair or replace the failed original source core and agents, you need to move the data from

your failed-over machines to restore the source machines.

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