Assuming a disk has 200 cylinders, numbered 0--199 and has just finished No. 130 cylinder service request. The read-write head is located at the No. 143 cylinder now. Assuming the request sequence is as below: 55, 718, 39, 18, 90, 160, 150, 38, 184, please give the disk scheduling sequences and average seek lengths of first come first served (FCFS), shortest seek time first (SSTF) and scan (SCAN) algorithm.

时间: 2023-07-14 08:14:05 浏览: 90
Here are the disk scheduling sequences and average seek lengths for FCFS, SSTF, and SCAN algorithms: 1. FCFS (First Come First Served): - Sequence: 130, 55, 718, 39, 18, 90, 160, 150, 38, 184 - Seek lengths: - 75 (130-55) - 663 (718-55) - 679 (718-39) - 721 (718-18) - 53 (90-18) - 70 (160-90) - 10 (160-150) - 105 (184-79) - 146 (199-53) - Average seek length: (75+663+679+721+53+70+10+105+146)/9 = 348.22 2. SSTF (Shortest Seek Time First): - Sequence: 130, 150, 160, 184, 55, 38, 39, 18, 90, 718 - Seek lengths: - 20 (150-130) - 10 (160-150) - 24 (184-160) - 75 (55-18) - 17 (90-73) - 17 (55-38) - 1 (39-38) - 21 (90-69) - 628 (718-90) - Average seek length: (20+10+24+75+17+17+1+21+628)/9 = 113.44 3. SCAN (Elevator): - Sequence: 130, 150, 160, 184, 199, 55, 39, 38, 18, 90, 718 - Seek lengths: - 20 (150-130) - 10 (160-150) - 24 (184-160) - 15 (199-184) - 144 (199-55) - 16 (55-39) - 1 (39-38) - 20 (90-70) - 628 (718-90) - Average seek length: (20+10+24+15+144+16+1+20+628)/9 = 132.22 Therefore, the shortest seek time first (SSTF) algorithm has the lowest average seek length of 113.44.
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