It is possible to use VisualCron in a fail over clustered environment. However, VisualCron must be manually activated for each cluster.
To prepare your server you have to:
1.Install VisualCron on the shared drive
2.Check "Is in cluster" in the Server settings window of VisualCron
You must have a license for each server you plan to activate.
We have various topics in our forum online discussing this: