Computers and Technology, 05.05.2020 07:18 spowell4657

Assume that we have the following two magnetic disk configurations: a single disk and an array of four disks. Each disk has 12 surfaces, 27,723 tracks per surface, and 528 sectors/track. Each sector holds 512 bytes, and it revolves at 7,200 RPM. The minimum, maximum, and average seeks times are 0.5 ms, 10.5 ms, and 4.9 ms, respectively. Calculate the performance in both I/Os per second and megabytes per second of these two disk organizations assuming the request pattern is reads of 4 KB of sequential sectors where the average seek distance is 10 tracks. Assume the 4 KB are aligned under the same arm on each disk in the array. Fill in the missing data below to help you. You can find the exact seek time using the formula given in the book, but for this problem, use a value of 5 ms. Take T(controller) to be negligible.

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Assume that we have the following two magnetic disk configurations: a single disk and an array of fo...

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