Continuous Operation

If a next-tier historian that is configured for store-and-forward operations becomes unavailable, AVEVA Historian ensures these continuous operations:

• You can still add, modify and delete replication and summary objects in the local configuration of the lower-tier historian.

• You can store data locally for next-tier tags created before the next-tier historian became unavailable or while it is still unavailable.

Once the next-tier historian is available, the Replication Service does the following:

• Compares the latest replication and summary objects with the next-tier tags currently existing on the next-tier historian

• Performs a dynamic reconfiguration to ensure all data is synchronized.

• Sends reconfiguration history that was stored locally to the next-tier historian so it can be merged with other history information.

Once done, It will appear as though the disconnection between the tiers never took place.