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Introduction to Distributed Systems

11 CSE 380 Computer Operating SystemsInstructor: Insup LeeUniversity of PennsylvaniaFall 2003 Lecture Note: Distributed Systems2 Introduction to Distributed Systems Why do we develop Distributed Systems ? availability of powerful yet cheap microprocessors (PCs,workstations), continuing advances in communication technology, What is a Distributed system ? A Distributed system is a collection of independent computers thatappear to the users of the system as a single system . Examples: Network of workstations Distributed manufacturing system ( , automated assembly line) Network of branch office computers3 Distributed SystemsComparison of three kinds of multiple CPU systems4 Advantages of Distributed Systemsover Centralized Systems Economics: a collection of microprocessors offer a betterprice/performa

Disadvantages of Distributed Systems Software: difficult to develop software for distributed systems Network: saturation, lossy transmissions Security: easy access also applies to secrete data 7 Software Concepts •Software more important for users •Two types: 1.Network Operating Systems 2.(True) Distributed Systems 8 Network Operating Systems

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