Page 166 - DCAP403_Operating System

Ramandeep Kaur, Lovely Professional University Unit 9: I/O & Secondary Storage Structure

Unit 9: I/O & Secondary Storage Structure Notes

CONTENTS

Objectives
Introduction
9.1 I/O Systems
9.2 I/O Hardware
9.2.1 Input Device
9.2.2 Output Device
9.3 Application I/O Interface
9.4 Functions of I/O Interface
9.5 Kernel I/O Sub-system
9.6 Disk Scheduling
9.7 Disk Management
9.8 Swap Space Management
9.8.1 Pseudo-Swap Space
9.8.2 Physical Swap Space
9.8.3 Three Rules of Swap Space Allocation
9.9 RAID Structure
9.10 Summary
9.11 Keywords
9.12 Self Assessment
9.13 Review Questions
9.14 Further Readings

Objectives

After studying this unit, you will be able to:

Define I/O systems
Describe I/O hardware

Explain application I/O interface
Know disk scheduling
Describe swap space management
Explain RAID structure

Introduction

The central processing unit is the unseen part of a computer system, and users are only dimly
aware of it. But users are very much aware of the input and output associated with the computer.
They submit input data to the computer to get processed information, the output. One of the
important tasks of the operating system is to control all of the I/O devices, such as issuing
commands concerning data transfer or status polling, catching and processing interrupts as well

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