Forcing failover

It is possible to force a failover in a pair of redundant AppEngines by simply setting the attribute ForceFailoverCmd in the active engine to "true." This can be accomplished using the ObjectViewer, an object script or any other application that has access to this attribute.

Use this attribute in a script (with any set of conditions) to trigger a failover. For example, you can monitor the status of other applications on the same machine, hardware devices, and based on that status, trigger a failover to the standby engine.

When a failover occurs, the Standby engine becomes Active and stays in that status unless the system is forced to fail back when the new Standby engine becomes available. In this case, the ForceFailoverCmd can be used to take the Active engine back to the original node.

For details on the attributes associated to a Redundant AppEngine please refer to the AppEngine Help files.