Suppose that a disk drive has 6,000 cylinders, numbered 0 to 5,999. The drive is currently serving a request at cylinder 3,250, and the previous request was at cylinder 4,805. The queue of pending requests, in FIFO order, is: 1515, 1212, 1296, 3800, 544, 618, 356, 2523, 5965, 4681 Starting from the current head position, what is the total distance (in cylinders) that the disk arm moves to satisfy all the pending requests for each of the following diskscheduling algorithms? a. FCFS b. SSTF c. SCAN d. LOOK

Database System Concepts
7th Edition
ISBN:9780078022159
Author:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Publisher:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Chapter1: Introduction
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Suppose that a disk drive has 6,000 cylinders, numbered 0 to 
5,999. The drive is currently serving a request at cylinder 3,250, and the previous request 
was at cylinder 4,805. The queue of pending requests, in FIFO order, is:
1515, 1212, 1296, 3800, 544, 618, 356, 2523, 5965, 4681
Starting from the current head position, what is the total distance (in cylinders) that the
disk arm moves to satisfy all the pending requests for each of the following diskscheduling algorithms?
a. FCFS
b. SSTF
c. SCAN
d. LOOK

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