We have a magnetic hard drive. The arm is at cylinder 25. Disk requests come in to the disk driver for eylinders 30, 23, 10, 7, 40, 8, and 35. The arm needs 2 ms to move to the adjacent cylinder. How mach seek time is needed for each of the following algorithms (a) first-come, first-served; (b) closest cylinder next; (e) the elevator algorithm.
We have a magnetic hard drive. The arm is at cylinder 25. Disk requests come in to the disk driver for eylinders 30, 23, 10, 7, 40, 8, and 35. The arm needs 2 ms to move to the adjacent cylinder. How mach seek time is needed for each of the following algorithms (a) first-come, first-served; (b) closest cylinder next; (e) the elevator algorithm.
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
Section: Chapter Questions
Problem 1PE
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Transcribed Image Text:We have a magnetic hard drive. The arm is at cylinder 25. Disk requests come in to the
disk driver for cylinders:
30, 23, 10, 7, 40, 8, and 35.
The arm needs 2 ms to move to the adjacent cylinder. How much seek time is needed for
each of the following algorithms:
(a) first-come, first-served;
(b) closest cylinder next;
(c) the elevator algorithm.
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