Virtual command rollback in a fault tolerant data processing system
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United States of America Patent
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Jun 14, 1988
Grant Date -
N/A
app pub date -
Jun 24, 1985
filing date -
Jun 24, 1985
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A fault tolerant data processing system includes a pair of processors for simultaneously executing commands for processing data, a memory, and a data transmission bus between the processors and the memory voer which the processors may fetch data from and write data to the memory. A comparison circuit is included between the processors for comparing the data fetched and written by the processors. A rollback module is responsive to the comparison circuit for rolling back the operation of the processors to the beginning of a presently executing command in the event of a miscomparison by the comparison circuit.
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