Proceedings of the 2005 International Conference on Simulation and Modeling
نویسنده
چکیده
Reliability enhancement in software system is a crucial and challenging issue. Applying efficient fault-tolerant mechanism can fulfill the system reliability requirement. This paper proposes reliability models for hierarchical and hybrid fault-tolerant software systems considering failure dependencies or related faults in software components/versions. Our system models are based on the classical Recovery Block (RB) and N-Version Programming (NVP) schemes which are the most commonly used software fault-tolerant architectures. Our software system reliability models are generalized for higher degree of fault tolerance when higher number of software versions is provided. We perform reliability evaluation and comparison of these reliability models together with the classical models of RBs and NVPs.
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