Data Mirroring

The measurements data that is collected at interval, as well as the derived data that is periodically computed, is stored on the active/primary collection platform and mirrored on the standby/secondary platform. Any MEAS reports generated after the role change are identical to the reports generated before the role change. The duplication of the collected data provides an additional measure of reliability for the Measurements Subsystem.

In the event that the standby/secondary platform is unavailable when the mirroring occurs, that data is retained on the active/primary, but it is not retained on the standby/secondary. If a role change occurs, any data collected while the standby/secondary was unavailable will not be available for reporting. A second role change is required if it is necessary to report the missing data.