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What is a Distributed System

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What is a Distributed System

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    1. What is a Distributed System? From various textbooks: “A distributed system is a collection of independent computers that appear to the users of the system as a single computer.” “A distributed system consists of a collection of autonomous computers linked to a computer network and equipped with distributed system software.” “A distributed system is a collection of processors that do not share memory or a clock.” “Distributed systems is a term used to define a wide range of computer systems from a weakly-coupled system such as wide area networks, to very strongly coupled systems such as multiprocessor systems.” Bring in Doonesbury cartoon “What’s a web site?” Today = 1.1 What is a Distributed System? Goal is to get a picture of what a distributed system is, and how it differs from Traditional centralized system Parallel system We’ll start this process today, and continue with this topic next time Do you agree with these definitions? Why or why not? Tanenbaum Coulouris, Dollimore, Kindberg Silberschatz, Galvin What is a clock? ?? Not sure I agree with this one — “multiprocessor” will mean something else to us Some common features: Multiple computers Network & communicationBring in Doonesbury cartoon “What’s a web site?” Today = 1.1 What is a Distributed System? Goal is to get a picture of what a distributed system is, and how it differs from Traditional centralized system Parallel system We’ll start this process today, and continue with this topic next time Do you agree with these definitions? Why or why not? Tanenbaum Coulouris, Dollimore, Kindberg Silberschatz, Galvin What is a clock? ?? Not sure I agree with this one — “multiprocessor” will mean something else to us Some common features: Multiple computers Network & communication

    2. Is every system with >2 computers a distributed system?? Email, ftp, telnet, world-wide-web Network printer access, network file access, network file backup We don’t usually consider these to be distributed systems… What is a Distributed System? (cont.)

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