Oliver Bodemer
IBM J. Res. Dev
Paper
A model of shared DASD and multipathing
Abstract
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. © 1980, ACM. All rights reserved.
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