Before You Begin

Before you start migrating your Classic or Advanced Historian data, be aware of the following:

Confirm that your Historian environment is set up. For more information, refer to the Getting Started with Historian manual.
Confirm that you have ample disk space on the archive machine. Assume that you need to have at least as much free space as the amount of data that you intend to migrate. For example, if you have 300MB of Advanced Historian data, you need at least 300MB free disk space on the Historian Server to accept that data.
Do not uninstall Advanced Historian until you have migrated all the data to your Historian. Advanced Historian must be running and must have all its components in place for migration. The Historian Server that you are migrating to does not need to be on the same computer as the Advanced Historian or Classic data that you are migrating.
Migrating a large amount of data from Advanced or Classic Historian into Historian may take a substantial amount of time, depending on the size of the database and the processing power of your machines. For more information, refer to Estimating Migration time.
When migrating Historical data from a SCADA node to an Historian Server, it is recommended that you have an iFIX database loaded for the corresponding iFIX historical tags (on the source machine) prior to migration so that descriptions and EGUs can be retrieved.
When migrating Historical data to Historian, it is recommended that you migrate the data in chronological order from the oldest to the newest. This prevents adding data out of order, which may impact migration performance and disk space usage.
Migrate collection groups before historical data to maintain collection rates and deadbands.
For migrating alarms and events data, determine the location and time range of your iFIX alarms logged via Alarm ODBC.