1994-03-25
1996-08-06
Beausoliel, Jr., Robert W.
39518209, G06F 1134
Patent
active
055443044
ABSTRACT:
The present invention provides a method and apparatus for reducing the overhead required in conventional fault tolerant processing by redundant processors. Commands are received and queued by both the active and standby units but are processed only by the active unit. Short messages, each including a command identifier, are transmitted from the active unit to the standby unit. In addition, periodic handshaking signals are exchanged between the two units. In the event the active unit fails, the standby unit is automatically brought on-line to process the unprocessed commands and transmit responses to the command source. When the failed unit is restored, it can become the standby unit.
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patent: 4358823 (1982-11-01), McDonald et al.
patent: 4449182 (1984-05-01), Rubinson et al.
patent: 4777595 (1988-10-01), Strecker et al.
patent: 5214768 (1993-05-01), Martin et al.
patent: 5329625 (1994-07-01), Kannan et al.
Carlson Wayne C.
Greco Merrill B.
Meadows Michael J.
Beausoliel, Jr. Robert W.
Chung Phung M.
International Business Machines - Corporation
Shifrin D. A.
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