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A model of shared DASD and multipathing

By Yonathan Bard

Communications of the ACM, Vol. 23 No. 10, Pages 564-572

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This paper presents a model of an I/O subsystem in which devices can be accessed from multiple CPUs and/or via alternative channel and control unit paths. The model estimates access response times, given access rates for all CPU-device combinations. Central to the model's algorithm is the estimation of the rotational position sensing (RPS) miss probabilities by means of the maximum entropy principle. Performance differences strongly favored the English-based editor.

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