Fail-Silent Assumptions in Fault-Tolerant Systems

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Fail-silent units are implemented by using redundancy of system components. Errors are detected by comparison of the results produced by these components and in a case of a result mismatch the result is not delivered. This paper discusses and analyzes the definition of the fail silence in the context of safety-critical systems. Furthermore, it describes which items should be provided within a fault hypothesis for safety-critical systems. Instead of the definition of fail silence units, we propose the definition of detectable erroneous units (DEU), and describe a general model of a DEU for distributed fault-tolerant systems.
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Fail Silence; Fault Tolerance; Fault Hypothesis; Dependability Evaluation; Fault Injection

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