Fault tolerance using digests

Details Fault tolerance using digests Fault tolerance using digests

2011-07-26

2011-07-26

Beausoliel, Jr., Robert (Department: 2113)

Error detection/correction and fault detection/recovery

Data processing system error or fault handling

Reliability and availability

C714S011000

Reexamination Certificate

active

07987391

ABSTRACT:
A method and apparatus are provided, the method and apparatus comprising running a plurality of identical programs on a plurality of identical computers and recording information about at least some state updates done within each of the plurality of the identical programs running on the plurality of the identical computers using a plurality of digests of the at least some state updates. The method and apparatus also comprises comparing the plurality of the digests to determine whether at least one of the plurality of the identical programs running on the plurality of the identical computers has failed.

REFERENCES:
patent: 4135240 (1979-01-01), Ritchie
patent: 6263452 (2001-07-01), Jewett et al.
patent: 2003/0159083 (2003-08-01), Fukuhara et al.
Tanenbaum, Andrew S. “Structured Computer Organization (Third Edition)” (c) 1990 Prentice Hall, Inc. pp. 11-13.
“Firewall” Microsoft Computer Dictionary (Fifth Edition). Copyright 2002. Microsoft Press.
Handbook of Applied Cryptology. Copyright 1997 CRC Press, Inc. p. 33.

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