Storage partition locations

Every storage partition consists of up to four storage locations:

• Circular (mandatory)

• Alternate (optional)

• Buffer (optional, used for backward compatibility only)

• Permanent (optional, used for backward compatibility only)

The paths to the circular, buffer, and permanent storage partitions are initially defined during installation. The alternate storage partition can be defined later using the Operations Control Management Console.

Certain restrictions apply when specifying a path to the storage partition. The circular storage partition must be a local drive on the server, and the path must be specified using normal drive letter notation (for example, c:\Historian\Data\Circular). While the alternate, buffer, and permanent storage partitions can be anywhere on the network, it is strongly recommended to have the alternate storage partition configured on a dedicated physical drive locally attached by a high-speed interface to the Historian server or configured to be on a different internal hard drive. If you use a network location, the InSQLConfiguration virtual service account must have full access to the location. You can grant that access by using the credentials of the computer account in the format <domain_name>\<computer_name>$. The partition locations must be specified using UNC notation. Mapped drives are not supported.

Important: The alternate storage location must be available for Historian to start.

When planning your storage strategy, be sure to allow enough disk space for storing your plant data for the required length of time.

Note: If the Historian server runs out of disk space, an emergency shutdown is performed. After freeing disk space or specifying an alternate storage location, restarting the Historian may not correctly resume data acquisition. To resolve this, perform a complete shutdown and restart of the Historian. See Shut down the entire AVEVA Historian for detailed instructions.