Understand and configure failover

Failover in AVEVA adapters refers to the ability of a system to automatically switch from one adapter to another when the primary adapter fails or becomes unavailable. This ensures that data collection and transmission continue without interruption, maintaining system reliability and uptime. If one adapter stops working, failover ensures another one steps in to keep the data flowing.

The OPC UA adapter supports both client-level failover and server-level failover.

Server-level failover ensures that data keeps flowing even if the primary database server goes down. The adapter is set up with two connection strings—one for the main server and one for a backup—and automatically switches to the backup if needed. This helps reduce downtime and avoid data loss without requiring manual intervention.

Client-level failover means the adapter itself monitors its connection to the database and switches to a backup if the primary fails. This allows the adapter to keep collecting and sending data without needing help from the server or manual intervention.