5. U.S. Patent No. 9,298,390: Systems and methods for copying data maintained in a dynamic storage volume and verifying the copied data – Issued March 29, 2016
U.S. Patent No. 9,298,390 is the 5th patent granted to Cirrus Data Solutions Inc. This invention is a mechanism implemented to dynamically track data images migrated for integrity verification. The Cirrus Data migration appliance performs data migration on a live production environment where the data continues to change during the migration process. The Cirrus Data migration operation is asynchronous, and is performed in a multi-pass manner. Time slots are customized for weekdays, weekends, or holidays, each with specified aggressiveness. This flexible migration system allows data to be migrated efficiently, yet with minimal impact to production traffic. The dynamic data image tracking mechanism is created to enable verification of the data under this kind of dynamic operating environment. With this invention, the migrated data can be verified whenever a consistent intermediate image is achieved, independent of the capricious nature of the source data as well as the potentially elaborate migration schedule, therefore ensuring the fidelity of the migrated data.