Chapter 1 slides
Download as PPT, PDF0 likes496 views
The document discusses figures from an instructor's guide about distributed systems. Figure 1.1 shows a typical portion of the Internet including desktop computers, servers, network links, backbones, and satellite links. Figure 1.2 depicts a typical intranet with desktop computers connected to various servers through a local area network and router/firewall. Figure 1.3 illustrates portable and handheld devices connecting to intranets and the Internet through wireless technologies. Figures 1.4-1.6 provide statistics on the growth of computers and web servers on the Internet from 1979 to 1999. Figure 1.7 defines several types of transparency in distributed systems such as location, concurrency, replication, and failure transparency.
Chapter 1 slides
- 1. Slides for Chapter 1 Characterization of Distributed Systems From Coulouris, Dollimore and Kindberg Distributed Systems: Concepts and Design Edition 3, © Addison-Wesley 2001
- 2. Instructor’s Guide for Coulouris, Dollimore and Kindberg Distributed Systems: Concepts and Design Edn. 3 © Addison-Wesley Publishers 2000 intranet ISP desktop computer: backbone satellite link server: network link: Figure 1.1 A typical portion of the Internet
- 3. Instructor’s Guide for Coulouris, Dollimore and Kindberg Distributed Systems: Concepts and Design Edn. 3 © Addison-Wesley Publishers 2000 Figure 1.2 A typical intranet the rest of email server Web server Desktop computers File server router/firewall print and other servers other servers print Local area network email server the Internet
- 4. Instructor’s Guide for Coulouris, Dollimore and Kindberg Distributed Systems: Concepts and Design Edn. 3 © Addison-Wesley Publishers 2000 Figure 1.3 Portable and handheld devices in a distributed system Laptop Mobile Printer Camera Internet Host intranet Home intranet WAP Wireless LAN phone gateway Host site
- 5. Instructor’s Guide for Coulouris, Dollimore and Kindberg Distributed Systems: Concepts and Design Edn. 3 © Addison-Wesley Publishers 2000 Figure 1.4 Web servers and web browsers Internet BrowsersWeb servers www.google.com www.cdk3.net www.w3c.org Protocols Activity.html http://www.w3c.org/Protocols/Activity.html http://www.google.comlsearch?q=kindberg http://www.cdk3.net/ File system of www.w3c.org
- 6. Instructor’s Guide for Coulouris, Dollimore and Kindberg Distributed Systems: Concepts and Design Edn. 3 © Addison-Wesley Publishers 2000 Figure 1.5 Computers in the Internet Date Computers Web servers 1979, Dec. 188 0 1989, July 130,000 0 1999, July 56,218,000 5,560,866
- 7. Instructor’s Guide for Coulouris, Dollimore and Kindberg Distributed Systems: Concepts and Design Edn. 3 © Addison-Wesley Publishers 2000 Figure 1.6 Computers vs. Web servers in the Internet Date Computers Web servers Percentage 1993, July 1,776,000 130 0.008 1995, July 6,642,000 23,500 0.4 1997, July 19,540,000 1,203,096 6 1999, July 56,218,000 6,598,697 12
- 8. Instructor’s Guide for Coulouris, Dollimore and Kindberg Distributed Systems: Concepts and Design Edn. 3 © Addison-Wesley Publishers 2000 Figure 1.7 Transparencies Access transparency: enables local and remote resources to be accessed using identical operations. Location transparency: enables resources to be accessed without knowledge of their location. Concurrency transparency: enables several processes to operate concurrently using shared resources without interference between them. Replication transparency: enables multiple instances of resources to be used to increase reliability and performance without knowledge of the replicas by users or application programmers. Failure transparency: enables the concealment of faults, allowing users and application programs to complete their tasks despite the failure of hardware or software components. Mobility transparency: allows the movement of resources and clients within a system without affecting the operation of users or programs. Performance transparency: allows the system to be reconfigured to improve performance as loads vary. Scaling transparency: allows the system and applications to expand in scale without change to the system structure or the application algorithms.