Question

6.2 all parts please

Problems Consider an array of nine drives in which X0 through X7 contain data an parity disk. Provide an equation that describes the relationship between data and par- ity bits. 6.1 d X8 is the 62 Consider a disk with N tracks numbered from 0 to (N 1) and assume that requested sectors are distributed randomly and evenly over the disk. We want to calculate the average number of tracks traversed by a seek. a. First, calculate the probability of a seek of length j when the head is currently positioned over track t. Hint: This is a matter of determining the total number of combinations, recognizing that all track positions for the destination of the seek are equally likely b. Next, calculate the probability of a seek of length K. Hint: This involves the sum- ming over all possible combinations of movements of K tracks. Calculate the average number of tracks traversed by a seek, using the formula for expected value c. N-1 n(n + 1) n n(n + 1(2n Hint: Use the equalities: Σǐ=ー2 2 d. Show that for large values of N, the average number of tracks traversed by a seek 6 approaches N/3. Define the following for a disk system: 6.3 = seek time, average time to position head over track

Answer 1