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OpenSESAME—the simple but extensive, structured availability modeling environment

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  • Walter, Max
  • Siegle, Markus
  • Bode, Arndt

Abstract

This article describes the novel stochastic modeling tool OpenSESAME which allows for a quantitative evaluation of fault-tolerant High-Availability systems. The input models are traditional reliability block diagrams (RBDs) which can be enriched with inter-component dependencies like failure propagation, failures with a common cause, different redundancy types, and non-dedicated repair. OpenSESAME offers a novel set of graphical diagrams to specify these dependencies. Due to the dependencies, traditional solution methods for RBDs cannot be applied to OpenSESAME models. We therefore present a novel evaluation method, which is based on the automatic generation of several state-based models, which are semantically equivalent to the high-level input model. Alternatively, either stochastic Petri nets or textual models based on a stochastic process algebra can be generated. The state-based models are then analyzed using existing solvers for these types of models. Three case studies exemplify the modeling power and usability of OpenSESAME.

Suggested Citation

  • Walter, Max & Siegle, Markus & Bode, Arndt, 2008. "OpenSESAME—the simple but extensive, structured availability modeling environment," Reliability Engineering and System Safety, Elsevier, vol. 93(6), pages 857-873.
    • Handle: RePEc:eee:reensy:v:93:y:2008:i:6:p:857-873
    DOI: 10.1016/j.ress.2007.03.034
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    Cited by:

    1. M Pock & M Walter, 2008. "Efficient extraction of the structure formula from reliability block diagrams with dependent basic events," Journal of Risk and Reliability, , vol. 222(3), pages 393-402, September.
    2. Distefano, Salvatore & Puliafito, Antonio, 2009. "Reliability and availability analysis of dependent–dynamic systems with DRBDs," Reliability Engineering and System Safety, Elsevier, vol. 94(9), pages 1381-1393.

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