6.6.5 Manually Forcing Failover

In redundant systems, it is common to require that a particular Server in the RedundantServerSet be taken out of the RedundantServerSet for a period of time. Some items that could cause this may include:

Certificate update

Security reconfiguration

Rebooting or restarting of the machine for

software updates and patches

installation of new software

Reconfiguration of the AddressSpace

The removal from the RedundantServerSet can be done through a complete shutdown or by setting the ServiceLevel of the Server to Maintenance sub-range. This can be done through a Server specific configuration tool or through the Method RequestServerStateChange on the ServerType. The Method is formally defined in OPC 10000-5.

This Method requires that the Client provide credentials with administrative rights on the Server.