Mirroring

From Business Continuity Management (BCM) and Disaster Recovery (DR) Wiki Glossary

1. Mirroring is a strategy that maintains selected data such that both copies of the data (local and remote copies) are synchronized. This requires that updates to data be received at both the primary and secondary locations before the owning application is notified that the update is complete. This also requires dedicated hardware at both sites, with the capability to automatically transfer the workload between sites. Using this strategy, virtually no data will be lost in the event of a disaster, thus providing for continuous availability. The two sites should be physically removed from each other and should be capable of handling regional disasters, such as floods or hurricanes. Mirroring is popular term for RAID-1.