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Get Analysis of drum and disk storage units PDF

By Dr. Samuel H. Fuller (auth.)

ISBN-10: 0387071865

ISBN-13: 9780387071862

ISBN-10: 3540071865

ISBN-13: 9783540071860

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Skinner's model of a processor with latency. 28 latent for time B~ where B is a random variable~ possibly dependent on A 3 with distribution FB(t ). Let Z denote the sum of A and B~ and Fz(t ) the distribution function of Z. After a service-latency c y c l % the processor inspects the queue to see if there are any outstanding requests. If the queue is not empty~ a new service period begins. If the queue is emptyj the processor begins a new latency period of time F~ where F is a random v a r i a b l % independent of A and B, with distribution Fr(t).

6 / drum for R = 1/8. 0 I0 CO 49 distributed over some integer number of drum revolutions, the finishing address of an I/O request is not independent of its starting address. In particular, as the expected record length goes to zero, the average wait time for an I/O request approaches T/2, regardless of the arrival rate of I/O requests. 2 illustrates an interesting phenomenon with respect to the Abate and Dubner model: simulation model~ no change~ to within the accuracy of the is detectable between the difference in the simulation model and Abate and Dubner's model for R = 1/3 and R = 1/8.

Moreover~ is (n+2)(1-x)n+l~ 0 ~ x < I~ and has a mean of an obvious extension of the above expression to the following distribution two random variables functions for the difference leads between any separated by k-1 other points on the drum [Feller~ 1970 ] : (n+2 )(n+m) k-i xk-i

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Analysis of drum and disk storage units by Dr. Samuel H. Fuller (auth.)


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