Reliability Modeling of the MARS System: A Case Study in the Use of Different Tools and Techniques
نویسندگان
چکیده
Analytical reliability modeling is a promising method for predicting the reliability of di erent architectural variants and to perform trade o studies at design time However generating a computationally tractable analytic model implies in gen eral an abstraction and idealization of the real system Construction of such a tractable model is not an exact science and as such it depends on the modeler s intuition and experience This freedom can be used in formulating the same prob lem by more than one approach Such a N version modeling approach increases the con dence in the results In this paper we analyze the MARS architecture with the dependability eval uation tools SHARPE and SPNP employing several di erent techniques including Hierarchical modeling stochastic Petri nets folding of stochastic Petri nets and state truncation We critically examine these techniques for their practicability in modeling complex fault tolerant computer architectures
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