Data processing: database and file management or data structures – Database design – Data structure types
Reexamination Certificate
2004-06-14
2009-08-25
Lu, Kuen S (Department: 2156)
Data processing: database and file management or data structures
Database design
Data structure types
C707S793000, C707S793000
Reexamination Certificate
active
07580959
ABSTRACT:
An apparatus, system, and method are disclosed for efficient creation of point-in-time versions of data using differencing in a read-before-write environment. Included in an embodiment of the invention are a receive module that receives a data block sent from a primary data storage system, a read module that reads a data block from a secondary data storage device into random access memory, the data block corresponding to the data block sent from the primary data storage system, a comparison module that compares the data block sent from the primary data storage system to the data block from the secondary data storage device and creates a differencing data file, a compression module that compresses the differencing data file and to create a compressed differencing data file, and a differencing storage module stores the compressed differencing data file in a differencing storage device.
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Boyd Kenneth Wayne
Day III Kenneth Fairclough
Doatmas Phillip Matthew
Wolfgang John Jay
International Business Machines - Corporation
Kunzler & McKenzie
Lu Kuen S
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