VTU SAN Notes

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VTU BE CSE Sem 8 Storage Area Networks (SAN) notes

Unit No.: 01 - Introduction to Information Storage and Management, Storage System

Environment

Introduction

Information is increasingly important in our daily lives. We have become information dependents of the twenty-
first century, living in an on-command, on-demand world that means we need information when and where it is

required. We access the Internet every day to perform searches, participate in social networking, send and

receive e-mails, share pictures and videos, and scores of other applications. Equipped with a growing number of

content-generating devices, more information is being created by individuals than by businesses.

Information created by individuals gains value when shared with others. Figure 1-1 depicts this virtuous cycle of information.

Chapter Objective

This chapter describes the evolution of information storage architecture from simple direct-attached models to

complex networked topologies. It introduces the information lifecycle management (ILM) strategy, which

aligns the information technology (IT) infrastructure with business priorities.

1.1 Information Storage

Businesses use data to derive information that is critical to their day-to-day operations. Storage is a repository

that enables users to store and retrieve this digital data.

1.1.1 Data

Data is a collection of raw facts from which conclusions may be drawn. Handwritten letters, a printed book, a

family photograph, a movie on video tape, printed and duly signed copies of mortgage papers, a bank’s ledgers,

and an account holder’s passbooks are all examples of data.

The data can be generated using a computer and stored in strings of 0s and 1s, as shown in Figure 1-2. Data in

this form is called digital data and is accessible by the user only after it is processed by a computer.

The following is a list of some of the factors that have contributed to the growth of digital data:

1. Increase in data processing capabilities: Modern-day computers provide a significant increase in

processing and storage capabilities. This enables the conversion of various types of content and media from

conventional forms to digital formats.

2. Lower cost of digital storage: Technological advances and decrease in the cost of storage devices have

provided low-cost solutions and encouraged the development of less expensive data storage devices. This cost

benefit has increased the rate at which data is being generated and stored.

3. Affordable and faster communication technology: The rate of sharing digital data is now much faster than

traditional approaches. A handwritten letter may take a week to reach its destination, whereas it only takes a few

seconds for an e‐ mail message to reach its recipient.

The importance and the criticality of data vary with time. Most of the data created holds significance in the

short-term but becomes less valuable over time. This governs the type of data storage solutions used.

Individuals store data on a variety of storage devices, such as hard disks, CDs, DVDs, or Universal Serial

Bus (USB) flash drives.

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