Answered: Disk Scheduling and RAID Disk…

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

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Disk Scheduling and RAID

Disk scheduling is handled by operating systems for scheduling of input/output request for the disk in order to improve overall system performance. This is necessary because, for over four decades now,
the increase in the speed of processor and main memory is incomparable with that of the disk. Apart from speed, disk storage space is another important factor in determining the level of performance of a
system. Insufficient disk space can serve a bottleneck for system performance even when other resources are at high speeds. This have given rise to development of arrays of disks that operate independently and in parallel.

Question

Describe the scheduling algorithms that can be used by the operating system to manage disks’ I/O requests. Highlight the advantages and disadvantages.

Expert Solution

Step 1

Disk scheduling:

In a computer, multiple processes run over the same time.
To handle this multiple processes, the operating system decides which process has to be executed first. This technique is called as disk scheduling.
There are different scheduling algorithms are used by the Operating System to manage I/O request. Here we are describing the major scheduling algorithms.
- FCFS (First Come First Serve)
- SSTF (Shortest Seek Time First)
- SCAN
- CSCAN

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