Question 137 – Software-Engineering
December 5, 2023Question 9771 – Sequential-Circuits
December 5, 2023Question 8085 – Operating-Systems
Consider a disk queue with requests for I/O to blocks on cylinders 47, 38, 121, 191, 87, 11, 92, 10. The C-LOOK scheduling algorithm is used. The head is initially at cylinder number 63, moving towards larger cylinder numbers on its servicing pass. The cylinders are numbered from 0 to 199. The total head movement (in number of cylinders) incurred while servicing these requests is ___________.
Correct Answer: A
Question 27 Explanation:
From the question, we got the following information.
I/O to blocks on cylinders 47, 38, 121, 191, 87, 11, 92, 10.
C-LOOK scheduling algorithm is used.
Head is initially at cylinder number 63.
First start from 63
63 → 87 → 92 → 121 → 191 = 24 + 5 + 29 + 70 movements = 128
191 → 10 movements = 181
10 → 11 → 38 → 47 = 1 + 27 + 9 movements = 37
Total = 128 + 181 + 37 = 346
I/O to blocks on cylinders 47, 38, 121, 191, 87, 11, 92, 10.
C-LOOK scheduling algorithm is used.
Head is initially at cylinder number 63.
First start from 63
63 → 87 → 92 → 121 → 191 = 24 + 5 + 29 + 70 movements = 128
191 → 10 movements = 181
10 → 11 → 38 → 47 = 1 + 27 + 9 movements = 37
Total = 128 + 181 + 37 = 346
346
347
348
349
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