Historian HA

In Historian HA deployments, the primary and backup Historian connect to each other via socket. If the primary Historian stops, the backup takes over. If the primary then comes back on line, the primary takes over and the backup goes back into standby mode. Only the active Historian writes to the database.

The Historian is a client of the CentralServer and connects to it via fault tolerant URL (socket). This means that the CentralServer and Historians can fail over separately or together.