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A fail-stop processor halts instead of performing an erroneous state transformation that might be visible to other processors, can detect whether another fail-stop processor has halted (due to a failure), and has a predefined portion of its storage that will remain unaffected by failures and accessible to any other fail-stop processor. Fail-stop processors can simplify the construction of fault-tolerant computing systems. In this paper, the problem of approximating fail-stop processors is discussed. Use of fail-stop processors is compared with the state machine approach, another general paradigm for constructing fault-tolerant systems.
Fred B. Schneider (Tue,) studied this question.