Transcription of Distributed Systems CIS 505: Software Systems Introduction ...
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11 CIS 505: Software SystemsIntroduction to Distributed SystemsInsup LeeDepartment of Computer and Information ScienceUniversity of PennsylvaniaCIS 505, Spring 2007 CIS 505, Spring 2007 Distributed Systems2 Distributed Systems Why Distributed Systems ?oavailability of powerful yet cheap microprocessors (PCs,workstations, PDAs, embedded Systems , etc.)ocontinuing advances in communication technology What is a Distributed system ?oA Distributed system is a collection of independentcomputers that appear to the users of the system as a singlecoherent 505, Spring 2007 Distributed Systems3 Examples The world wide web information, resourcesharing Clusters, network of workstations Distributed manufacturing system ( ,automated assembly line) network of branch office computers -Information system to handle automaticprocessing of orders network of embedded Systems N
Sensor Networks (3) Figure 1-13. Organizing a sensor network database, while storing and processing data … or (b) only at the sensors. CIS 505, Spring 2007 Distributed Systems 48 The Challenges of Distributed Systems o Secure communication over public networks ACI: who sent it, did anyone see it, did anyone change it o Fault-tolerance
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