Data processing: database and file management or data structures – Database design – Data structure types
Reexamination Certificate
2007-10-16
2007-10-16
Truong, Cam Y (Department: 2162)
Data processing: database and file management or data structures
Database design
Data structure types
C707S793000, C711S112000, C711S162000, C711S202000
Reexamination Certificate
active
10920964
ABSTRACT:
An apparatus, system, and method are disclosed for differential data backup using snapshot on-write data. A snapshot module maintains an on-write data structure that captures a point-in-time or temporal instance of a data set by tracking modifications to data blocks of a data set. A backup module copies the data set to a backup data storage device as a full data set backup. In addition, the backup module copies each modified data block indicated by the on-write data structure and a differential time stamp to the backup data storage device as a differential data set backup. The full data set backup and one or more differential data set backups form a plurality of temporal instances of the data set. In one embodiment, a restore module recovers a selected instance of the data set responsive to receiving a restore command by copying the full data set backup to a target data storage device. In addition, the restore module may copy the differential data set backup to the target data storage device if the differential time stamp corresponds to a target time value.
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Adkins Janet Elizabeth
Chang Joon
Garimella Neeta
Ehichioya Fred I
International Business Machines - Corporation
Kunzler & McKenzie
Truong Cam Y
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