Lecture Operating systems: A concept-based approach (2/e): Chapter 15 - Dhananjay M. Dhamdhere

PROPRIETARY MATERIAL. © 2007 The McGraw­Hill Companies, Inc. All rights reserved. No part of this PowerPoint slide may be displayed, reproduced or distributed in any form or by any means, without the prior written permission of the publisher, or used beyond the limited distribution to teachers and educators permitted by McGraw­Hill for their individual course preparation. If you are a student using this PowerPoint slide, you are using it without permission. Chapter 15: Distributed Operating Systems Dhamdhere: Operating Systems— A Concept­Based Approach , 2 ed Slide No: 1 Copyright © 2008 Distributed Systems • Definition A distributed system consists of two or more nodes, where each node is a computer system with its own memory, some networking hardware, and a capability of performing some of the control functions of an OS – Thus, each node performs some OS functions * Data used by an OS function may be spread across many computers * Non-local data is accessed through the network Chapter 15: Distributed Operating Systems Dhamdhere: Operating Systems— A Concept­Based Approach , 2 ed Slide No: 2 Copyright © 2008 Distributed Systems • Distributed systems consist of four components – Individual computer systems – Network connecting the computer systems – Distributed computations – Distributed operating system We discuss the basics of these four components in this chapter Chapter 15: Distributed Operating Systems Dhamdhere: Operating Systems— A Concept­Based Approach , 2 ed Slide No: 3 Copyright © 2008 Benefits of distributed systems • Distributed systems provide five key benefits – Resource sharing * Sharing can occur across boundaries of computers – Reliability * High availability can be offered by exploiting multiplicity of resources – Computation speed-up * Processes of an application can be scheduled simultaneously – Communication * Users and processes in different nodes can communicate – Incremental growth * Cost of enhancing a capability is α additional capability desired Made possible by open system standards Chapter 15: Distributed Operating Systems Dhamdhere: Operating Systems— A Concept­Based Approach , 2 ed Slide No: 4 Copyright © 2008 Nodes in a distributed system • Nodes can be of different types – Workstation * Has a single CPU and single user – Minicomputer * Has a single CPU but many users It is also called a process pool node – Cluster * A group of nodes that work together in an integrated manner Chapter 15: Distributed Operating Systems Dhamdhere: Operating Systems— A Concept­Based Approach , 2 ed Slide No: 5 Copyright © 2008 ... - tailieumienphi.vn