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A fundamental failure model for fault-tolerant protocols

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2 Author(s)
Echtle, K. ; FB6, Essen Univ., Germany ; Masum, A.

The application area of distributed systems determines the extent to which protocols must provide fault detection and/or fault tolerance. Highest dependability can not be obtained without the cost of a substantial overhead. In order to reduce the message number and the time consumption, protocols should be tailored best to application requirements and system properties. This paper presents a novel failure classification as an instrument to limit fault detection and tolerance features to a reasonable failure set. Evaluation of protocols shows that just exclusion of “exotic” failures, which are most unlikely to occur enable a drastic increase in efficiency. Unlike other approaches, our failure classification is based on a completely functional model and on the definition of so-called failure capabilities. This overcomes the limitations of strictly hierarchic and time/value-based models. The new approach provides a framework to precisely specify common failure assumptions as well as very specialized scenarios-in particular so-called non-cooperative Byzantine failures

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Computer Performance and Dependability Symposium, 2000. IPDS 2000. Proceedings. IEEE International

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