The high availability fire drill detects discrepancies between the VCS configuration and the underlying infrastructure on a node. These discrepancies might prevent a service group from going online on a specific node. For IP resources, the high availability fire drill:
Checks for the existence of a route to the IP from the specified NIC
Checks for the existence of the interface configured in the IP resource
For more information about using the high availability fire drill see the Cluster Server Administrator's Guide.