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The authors discuss how probabilistic model checking, a variant of model checking, can be useful in modelling multiple failures in disk subsystems, as it allows specification of probabilities or rates of transitions also. Probabilistic model checking can be used to not only check the correctness of formulae that are augmented with a probability operator, but also to compute, as a side effect, probabilities and Markov rewards in response to queries expressed in an expressive logic. With exponential distributions for failures, it is possible to accurately compute the reliability of many non-trivial disk systems.
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