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An Analytic Response Time Model For Single-and Dual-Density Disk Systems

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2 Author(s)
Franklin, M.A. ; Department of Electrical Engineering, Washington University ; Sen, A.

The question of replacing a single-density, two-channel, two-controller disk system with a cheaper, plug-compatible, dual-density, single-channel system having the same capacity is considered. An analytical model is explored to examine the effect of such a replacement on average response time, that is, the time between issuing an I/O request and completion of the request. Queueing theory is used to obtain curves of response time versus arrival rate, and the results are compared with corresponding curves obtained by a simulation model.

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Computers, IEEE Transactions on  (Volume:C-23 ,  Issue: 12 )