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Operation System (Protection (I/O Protection (All I/O are classed as…

- - - - Interrupts computer when time limit is over
      - Decrements by 1 and used to implement time sharing
- - - - Has numeric keypad and indicating lights
    - - Share resources and exchanges info
      - Maximize resource utilization
  - - - Manage resource
    - - Prevent error
- - - - Assymetric
        
        One machine at hot standby mode
      - Symmetric
        
        Multiple nodes running application,monitoring each other
      - Using sharing strorage via SAN
      - High availability service which survives failure
    - - Less Power
      - On chip communication is faster
      - More efficient
    - - Economy
      - Increased throughput
      - More reliable
- - - - Virtual memory-execution of process not completely in memory