Abstract
A fault-tolerant computing system performs its intended functions irrespective of the occurrence of certain failures. As the system becomes more and more reliable with built-in fault-tolerance, its analysis, validation and comparison with another system become formidable tasks. Such a study involves issues such as fault classification, figures of merit, fault-tolerant architectures, coverage estimation and automated methods of reliability evaluation. This paper provides a comprehensive survey of all these topics. The new concept of performability, which combines both the performance and the reliability of a system, and the configuration optimisation of a gracefully degradable computing system are also discussed.
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