UniInt failover points for Phase 1 failover

Each failover pair requires that six (6) failover control points and two (2) optional state points be defined:

• UFO Active ID In

• UFO Active ID Out

• UFO Heartbeat 1 In

• UFO Heartbeat 1 Out

• UFO Heartbeat 2 In

• UFO Heartbeat 1 Out

• UFO Interface 1 State

• UFO Interface 2 State

The failover control points are interface-specific points, so the ICU is unable to aid in the creation of these points. However, the ICU will display the failover control points if they are found:

Active ID Point

The active ID point is located on the data source and identifies which copy of the interface is primary. The primary interface active ID value is set by the /UFO_ID=n startup command-line parameter for the primary interface copy. The value of n must be a positive integer. The value of the active ID point is referred to as the ActiveID.

Heartbeat Point

The heartbeat point is used to indicate that the interface is functioning. This point is updated once every failover update interval.

If the interface is connected to the PI Server, the value of the heartbeat point is incremented by UniInt from 1 - 15 and then wraps around to a value of 1 again. If the connection to the PI Server is lost, the value of the heartbeat point is incremented from 17 - 31 and then wraps around to a value of 17 again.

Once the connection to the PI Server is restored, the heartbeat values will revert back to the 1 - 15 range. During a normal shutdown process, the heartbeat value is set to zero.