DS notes #2

dated- 18-1-2017


  • Distributed Computing model


Classifications

  1. Mini computer model
  2. Workstation model
  3. Workstation server model
  4. Processor pool model
  5. Hybrid model

  1. Mini computer model



  • Extension - centralised time - sharing system.
  • Remote access - other microcomputers.
  • Network - allows access remote resources.
  • Example - early ARPANET.



2) Workstation model




  • Idle workstation - process jobs other workstation.
  • Not simple to implement.

Issues

  • Idle workstation.
  • Process transferred
  • Example- sprite system and xerox PARC.



3) Workstation server model


4)Processor pool model




  • Run server - manages and allocates processor.
  • Example- ameoba, plan g and cambridge DCS.




5) Hybrid model


  • combines - workstation - server and processor pool model.



  • Advantages of distributed systems


  1. Information sharing among geographically distributed users.
  2. Resource sharing
  3. Better price - performing ratio
  4. Higher reliability and availability against component failures.
             Reliability - multiple copies of data.
             Availablity - redundancy.
     5) Starter response time and higher through put.
     6) extensibility
     7) Better flexibility.

DS notes #2 DS notes #2 Reviewed by akshay salve on 12:12 AM Rating: 5

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