act of switching the source or target of information.

Note 1 to entry: In OPC UA redundant systems, a Failover is the act of a Client switching away from a failed or degraded Server to another Server in the redundant set (Server failover). In some cases a Client may have no knowledge of a Failover action occurring (transparent redundancy). A Client failover is the act of an alternate Client replacing an existing failed or degraded Client connection to a Server.