1introds - Introduction to Distributed Systems Definition:...

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Introduction to Distributed Systems Definition: A distributed system is a collection of independent computers that appears to the users of the system as a single computer. Three advances from the 80s Powerful micro-processor: 8-bit, 16-bit, 32-bit, 64-bit x86 family, 68k family, Alpha chip Clock rate: 4.77MHz up to 4.0 GHz Computer network Local Area Network (LAN), Wide Area Network (WAN), MAN, Wireless Network (Wi-Fi), Mobile Network (3G/UMTS) Network type: Ethernet, Token-bus, Token-ring, FDDI, ATM, Fast-Ethernet, Gigabit Ethernet, Fibre Channel Transfer rate: 64 kbps up to 1Gbps Secondary storage (Hard Disk) 5-10Mb(85), 100-250Mb(90), 1Gb(93), 4-6Gb(97), 10-20Gb(00), 80-120+Gb. Example: A number of workstations plus a pool of processors in a department’s network. If the system as a whole looked and acted like a single processor timesharing system, it would qualify as a distributed system.
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Distributed Systems VS. Centralized Systems Advantages Economics : Microprocessors offer a better price / performance than mainframes Speed : A distributed system may have more total computing power than a mainframe. Inherent distribution : Some application like banking, inventory systems involve spatially separated machines Reliability : If 5% of the machines are downed, the system as a whole can still survive with a 5% degradation of performance. Incremental growth : Computing power can be added in small increments Data sharing : Allow many users access to a common database Device sharing : Allow many users to share expensive peripherals. Communication
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1introds - Introduction to Distributed Systems Definition:...

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