Disk requests are received by a disk drive forcylinder 20, 25, 45, 5, 10, 17, 60, 70, 35, 90.Currently head is at cylinder 50. A seek takes 2msec per cylinder moved. How much seek timeis required for a shortest seek time firstalgorithm?

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Answered: y a disk drive fo 60, 70, 35, 90. 50. A…

Engineering

Computer Science

y a disk drive fo 60, 70, 35, 90. 50. A seek take ow much seek

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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Concept explainers

Fundamentals of Input and Output Performance

The I/O subsystem is a component of computer system design that uses buses to assist communication between the Central Processing Unit, Computer Memory/Storage, and Input and Output Devices (that is known as peripheral devices). The I/O subsystem includes disc controllers, tape drives, discs, system buses, and other devices. The I/O database application reads and writes drives using the operating system windows I/O.

Question

Disk requests are received by a disk drive for
cylinder 20, 25, 45, 5, 10, 17, 60, 70, 35, 90.
Currently head is at cylinder 50. A seek takes 2
msec per cylinder moved. How much seek time
is required for a shortest seek time first
algorithm?

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