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  • Computing Resource ParadigmsCS3353

  • Computing Resource ParadigmsCentralized ComputingDistributed Computing

  • Early Centralized Computing ParadigmCharacterized by one central computer.Housed in a limited access, climate controlled room.A shared resource users connect through dumb-terminals.Limited interactive access.Jobs are submitted through batch job-queues.

  • Centralized ComputingThere remain highly specialized computer systems of this type:Supercomputers designed for special resource intensive problem solving.

  • Cray T3E/512-PE Supercomputer Mainframe

  • Centralized Computing AdvantagesIdeal for maintaining a high level of security.Climate controlled environment is equipment friendly.Reduces maintenance costs.

  • Distributed ParadigmDemand driven by departments wanting access to more computing resources beyond the confines of centrally controlled systems.Unix becomes a popular operating system for this paradigm.HP, Sun, SGI, and others ride this wave during the 1980s.

  • DEC Micro-VAX

  • Client-ServerThe spread of networks and low cost network hardware led to the client-server computing paradigm. This successfully merges the two central and distributed paradigms.Computers are interconnected by a network. The computers are classified as either clients or servers in the network.

  • ServerA powerful computer configured to provide services to other computers within a computing system environment.Example Services:DiskPrinterApplicationE-mailetc

  • ServerThe server is typically a powerful computer configured with:Fast processors (1 or more)Fast and reliable disk storageMemory rich

  • ServerCentral location for the server allows ease of maintenance and high levels of security.Simplifying the maintenance of the system helps control costs.Small operations (businesses) can put a powerful central computing system in a small room. There it can be relatively secure and easy to maintain.

  • Server Rack

  • Behind the Server Rack

  • The ClientA client is configured to access specific services within the boundary of the defined computing system environment.Client classifications:Fat client: fully functional workstationThin client: a dumb terminal or graphical displayHybrid client: between thin and fat.

  • ClientFat clients are fully functional computers with local storage and computing capability. Thin clients rely on a server to provide storage and computing resources. Characterized as diskless and without a processor.Hybrid clients provide some computing resources independent of a server; storage is provided by a server.

  • ClientThin/Hybrid clients can cost less than fat-clients to purchase and maintain when carefully chosen.Work well for:public access areashigh security environmentsWhen full function workstations are unnecessary.Reduces maintenance for cost conscious businesses.

  • $300 client

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