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distributed Computing system model


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distributed Computing systems model from subject distributed operating systems

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distributed Computing system model

  1. 1. VMV COMMERCE, JMT ARTS & JJP SCIENCE COLLEGE (Institute of Computer Studies and Research) Wardhaman Nagar, Nagpur-08 Created By:Harshad D. Umredkar MCA-II (Sem-II) 2013-14 1
  2. 2. Introduction DCS Models Conclusion 2
  3. 3.   Processors->Communication Network->Local memory/Peripherals Resources: Local  Remote 3
  4. 4.      Minicomputer Model Workstation Model Workstation Server Model Processor Pool Model Hybrid Model 4
  5. 5.   Extension of the centralized time sharing system. few minicomputers  Remote access to other minicomputers.  resource sharing with remote users is desired. 5
  6. 6. The distributed system based on minicomputer model 6
  7. 7.     Consists of several workstations. The workstations are independent computers with memory, hard disks, keyboard and console. A company's office or a university department may have several workstations scattered throughout a building or compass. User logs onto one of the workstations called his or her home workstation 7
  8. 8. A distributed system based on the workstation model 8
  9. 9. This model is not so simple to implement because several issues must be resolved. These issues are as follows: Idle workstation How is a process transferred from one workstation to get it executed on another workstation a workstation that was idle until now and was being used 9
  10. 10.  few minicomputers and several workstations interconnected ◦ Diskfull Workstation ◦ Diskless Workstation  types of services, such as database service and print service 10
  11. 11. Fig 3: A Distributed System based on the workstation-server model 11
  12. 12.    Cheaper Diskless workstations are also preferred to dishful workstations from a system maintenance point of view. Users have the flexibility to use any workstation  The request-response protocol  Guaranteed response time . 12
  13. 13.     large number of microcomputer and minicomputers based on the observation that most of the time a user does not need any computing power A user submits a Job for computations are temporarily assigned to the job by the run server the entire processing power is available for use by the currently logged-users 13
  14. 14. Figure 4: A distributed computing system based on processor-poor model 14
  15. 15.  Based on the workstation-server model but with the addition of a pool of processors.  Requires several computers concurrently for efficient execution.  Gives guaranteed response to interactive jobs by allowing them to be processed on local workstations of the users.  Process allocated dynamically for the computations.  More expensive. 15
  16. 16.    The concept of distributed computing is the most efficient way to achieve the optimization. It deals with systems(hardware and software) , that contain more than one processing / storage and run in concurrently. Main motivation factor is resource sharing. 16
  17. 17. 17