Faulty module location in a fault tolerant computer system

Details Faulty module location in a fault tolerant computer system Faulty module location in a fault tolerant computer system

1996-07-01

1998-08-25

Canney, Vincent P.

Excavating

371 224, 39518209, G06F 1160

Patent

active

057990220

ABSTRACT:
A fault tolerant computer system includes a number of lockstep subsystems, each of which comprises a parallel input signature generator, used for data compression to allow practical comparison of the operation of internal modules of the lockstep subsystem, and a logic analyzer which stores the outputs of the internal modules of the lockstep subsystem. A signature comparator is connected to receive the signatures from the signature generators of the individual lockstep subsystems. The signature comparator generates a trigger signal for triggering the logic analyzers on detecting a difference in the signatures. The logic analyzers store enough states to include the first difference from a module following a detected difference in the signature outputs. The logic analyzer traces are searched automatically after an out-of-sync event to locate the first difference in operation and to determine which internal module provided the faulty output and then that module is labelled as broken.

REFERENCES:
patent: 5271023 (1993-12-01), Norman
patent: 5382950 (1995-01-01), Gronemeyer

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