Distributed systems

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Control[1]

From John Rayworth's excellent site (here):

Centrally controlled system - A hardware and/or software IT system in which all parts of it are controlled by a central controller/server/mainframe[2].

Distributed system: is a system in which components located on networked computers communicate and coordinate their actions by passing messages. The components interact with each other in order to achieve a common goal[3].

An important distinction

Please remember, for the rest of your life, the image below, and the distinction between centralized, decentralized, and distributed networksa group or system of interconnected people or things.. Although we are learning about control, this idea is used in many different areas of computer science. Image used from https://openclipart.org/detail/277506/Centralized-Decentralized-and-Distributed-Networks who have released this under the Creative Commons Zero 1.0 License

Centralized-Decentralized-and-Distributed-Networks-2017041028.png

Comparison of different systems

From the Dartford School[4]:

Advantages of central system:

  • Easier to administrate
  • More control

Advantages of distributed systems:

  • Quicker access
  • Shared load
  • Response more specific to environment

Disadvantages of distributed system:

  • More complex to administrate
  • Less control

Disadvantages of central systems:

  • Slower access
  • Computing load is on (usually) one device.
  • Response to a less specific environment

Do I understand this?

Sample test question

Standards

  • Compare a centrally controlled system with a distributed system

References