Application recovery from network-induced data corruption

Details Application recovery from network-induced data corruption Application recovery from network-induced data corruption

2011-08-02

2011-08-02

Corrielus, Jean M (Department: 2162)

Data processing: database and file management or data structures

Data integrity

Checking consistency

C707S691000, C707S697000, C707S699000, C714S758000, C714S750000, C714S748000, C714S048000, C709S251000

Reexamination Certificate

active

07991750

ABSTRACT:
A source application reads a body of data in data block sized units and calculates a checksum value for each data block before sending the data block, the calculated checksum value and the identifier. Upon receipt, a destination application independently calculates a checksum value for each received data block and compares the two checksums. Non-matching checksums indicate a network-induced error in the data block. Identifiers for the erroneous data blocks are transmitted to the source application after all of the data blocks have been initially transmitted. The source application thereafter resends only those data blocks identified. The destination application repeats the process of comparing checksums and transmitting identifiers to the source application until all of the data blocks of the body of data have been correctly received, and then uses the data blocks to recreate the body of data.

REFERENCES:
patent: 5235680 (1993-08-01), Bijnagte
patent: 5687314 (1997-11-01), Osman et al.
patent: 7394769 (2008-07-01), Banerjee et al.
patent: 7562278 (2009-07-01), Lyakh et al.
patent: 2003/0097481 (2003-05-01), Richter
patent: 2005/0036452 (2005-02-01), Banerjee et al.
patent: 2007/0157069 (2007-07-01), Lyakh et al.

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