Manual Data Recovery

About this task

Manual recovery can be performed from the Historian Administrator. Initiate manual recovery by following these steps:

To initiate manual data recovery:

Procedure

  1. In the Historian Administrator, select the OPC HDA collector.
  2. Click Recalculate. The Recalulate dialog appears.
  3. Enter start and end time and choose all or selected tags based on criteria from Recalculate window.
  4. Click Recalculate.
    Once manual recalculation starts, the collector recovers selected tags data from OPC HDA server to GE Historian between start time and end time.

    It is advised to choose small time intervals, so that load on OPC HDA server/collector will be reduced.

    At the time of recovery, if the connection to OPC HDA Server is lost, and if the Reconnect mechanism is enabled, the collector will try to connect to the server and pull the data once connection re-establishes.

    Manual recalculate is for filling the data gaps not for filling old data.

    For example:

    Assume that the collector is connected to GE Historian for the first time today and the archive was created at 10 am. The user initiates manual recalculation from 1am to 2 am. For that time interval, the archives were not even created. With respect to Historian it is old unknown data and the data write fails. If there is a data gap between 1pm to 2 pm, manual recalculation successfully fills the data gap.