Method and apparatus for fault-tolerant multiprocessing system recovery from power failure or drop-outs
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United States of America Patent
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Jul 27, 1999
Grant Date -
N/A
app pub date -
Jun 23, 1994
filing date -
Jun 23, 1994
priority date (Note) -
Expired
status (Latency Note)
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Abstract
Multiple processors are connected to form a multiprocessor system having interprocessor communicating capability. In the face of a power-fail signal, indicating that possible power loss is imminent, a processor will proceed through a shut-down procedure to save the present operating state so that when power is re-applied the processor can continue from the operating state it left when power was lost. The shut-down procedure concludes with the processor broadcasting messages to all other processors that it is undergoing a power-fail shut-down which is noted by the other processors to later cause them to enter a cautious mode of operation so as to not exclude the processor in any system configuration involving agreement of all processors by reason of the processor's loss of power.
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