In redundant systems, it is common to require that a particular Server in the Redundant Server Set be taken out of the Redundant Server Set 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 Redundant Server Set 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.