Failover configuration

PI Interface for OPC DA provides two methods for configuring failover, to ensure that data collection continues if either the interface or the OPC server fails:

• UniInt failover

  If one instance of PI Interface for OPC DA fails, another instance can take over data collection.

  Note: UniInt failover is a feature common to UniInt-based interfaces. For more information about configuring UniInt failover, see the Introduction to PI Universal Interface.

• OPC server-level failover

  If PI Interface for OPC DA stops receiving data from the currently-connected OPC server, it can switch to another OPC server and resume data collection.

If you are configuring both types of failover, configure failover in the following order:

1. Configure and verify UniInt failover.

2. Disable UniInt failover.

3. Configure and verify OPC server-level failover.

4. Re-enable UniInt failover.

Windows Cluster failover is no longer recommended.