Edit storage location properties

Storage locations and the history blocks they contain can be designated as circular, permanent, buffer, or alternate. Paths to these storage locations are specified when the Historian is installed.

Important: Changing a storage location's path require reinitializing the system (that is, a complete shutdown and restart of the Historian). Also, if a change is made to the default data paths, these directories must be manually created. The Operations Control Management Console validates the path you specify.

To edit storage location properties

1. In the Operations Control Management Console, expand a server group and then expand a server.

2. Expand Configuration Editor, expand System Configuration, and then expand Storage.

3. Select Storage Partitions, and then click either Auto Summary or Main. All defined storage locations appear in the details pane.

4. Right-click a storage location, and then click Properties. The Properties dialog box appears.

   

5. In the Path box, type the path to the storage location. The circular storage location must be a local drive on the server machine, and the path must be specified using normal drive letter notation (for example, c:\Historian\Data\Circular). While the alternate, buffer, and permanent storage locations can be anywhere on the network, it is strongly recommended to have the alternate storage location 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 locations must be specified using UNC notation. Mapped drives are not supported. If the path you specify does not currently exist, it is created.

   Note: The paths to the storage areas are relative to the computer on which the Historian is running. If you are running Operations Control Management Console on a separate network computer than the Historian, the paths may not be same.

6. To disable the use of this path, select Path is Disabled. This option is not available for the circular storage location.

7. In the Deletion Threshold box, type the minimum amount of disk space, in megabytes, at which the system attempts to start freeing up space. The threshold applies to circular and alternate storage only. Typically, you should multiply the size of the average history block (before any compression) by 1.5 to determine the minimum threshold.

8. In the Maximum Size box, type the limit, in megabytes, for the amount of data to be stored to the specified location. The maximum size applies to circular and alternate storage only. If the maximum size is set to 0, all available space at the storage location is used.

9. In the Maximum Age box, type the age, in days, of data that will be deleted by system to free up disk space. The threshold applies to circular and alternate storage only. The minimum age is 2 days. A value of 0 indicates that no age threshold is applied.

   Note: The Deletion Threshold, Maximum Size, and Maximum Age options are unavailable for the permanent and buffer storage areas.

10. Click OK.