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head is at cylinder 130. The request queue is given as follows: 150, 40, 350, 100, 280 For each of the disk-scheduling algorithms given below, show (by plotting in the graphs below) the current position of head based on the disk arm movement to satisfy the above requests, and count the total distance (in cylinders) of the disk arm movement. First Come First Served (FCFS) 0 40 100 130 150 Total distance (disk arm movement) = Shortest Seek Time First (SSTF) 0 40 100 130 150 Total distance (disk arm movement) = LOOK - in the direction of increasing track number 40 100 130 150 280 280 280 350 350 350 399 399 399

head is at cylinder 130. The request queue is given as follows: 150, 40, 350, 100, 280 For each of the disk-scheduling algorithms given below, show (by plotting in the graphs below) the current position of head based on the disk arm movement to satisfy the above requests, and count the total distance (in cylinders) of the disk arm movement. First Come First Served (FCFS) 0 40 100 130 150 Total distance (disk arm movement) = Shortest Seek Time First (SSTF) 0 40 100 130 150 Total distance (disk arm movement) = LOOK - in the direction of increasing track number 40 100 130 150 280 280 280 350 350 350 399 399 399

Computer Networking: A Top-Down Approach (7th Edition)
Computer Networking: A Top-Down Approach (7th Edition)
7th Edition
ISBN:9780133594140
Author:James Kurose, Keith Ross
Publisher:James Kurose, Keith Ross
Chapter1: Computer Networks And The Internet
Section: Chapter Questions
Problem R1RQ: What is the difference between a host and an end system? List several different types of end...
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8. Consider one disk with 400 cylinders, numbered 0 to 399. Assume the current position of head is at cylinder 130. The request queue is given as follows: 150, 40, 350, 100, 280 For each of the disk-scheduling algorithms given below, show (by plotting in the graphs below) the current position of head based on the disk arm movement to satisfy the above requests, and count the total distance (in cylinders) of the disk arm movement. a. First Come First Served (FCFS) 0 40 100 130 150 Total distance (disk arm movement) =. b. Shortest Seek Time First (SSTF) 0 40 100 130 150 Total distance (disk arm movement) = c. LOOK - in the direction of increasing track number 0 40 100 130 150 Total distance (disk arm movement) = 280 280 280 350 350 350 399 399 399 d. Based on questions ac, specify the best algorithm for the given case above. Also explain TWO (2) reasons why the disk scheduling algorithm important in disk management.
Transcribed Image Text:8. Consider one disk with 400 cylinders, numbered 0 to 399. Assume the current position of head is at cylinder 130. The request queue is given as follows: 150, 40, 350, 100, 280 For each of the disk-scheduling algorithms given below, show (by plotting in the graphs below) the current position of head based on the disk arm movement to satisfy the above requests, and count the total distance (in cylinders) of the disk arm movement. a. First Come First Served (FCFS) 0 40 100 130 150 Total distance (disk arm movement) =. b. Shortest Seek Time First (SSTF) 0 40 100 130 150 Total distance (disk arm movement) = c. LOOK - in the direction of increasing track number 0 40 100 130 150 Total distance (disk arm movement) = 280 280 280 350 350 350 399 399 399 d. Based on questions ac, specify the best algorithm for the given case above. Also explain TWO (2) reasons why the disk scheduling algorithm important in disk management.
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