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System control apparatus including a master control unit and a slave control unit which maintain coherent information

  • US 5,870,301 A
  • Filed: 01/17/1996
  • Issued: 02/09/1999
  • Est. Priority Date: 03/30/1995
  • Status: Expired due to Term
First Claim
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1. A system control apparatus, comprising:

  • a master control unit to perform control, status monitoring, and maintenance of a computer system; and

    a slave control unit to operate in parallel with said master control unit and operate as a standby system while maintaining coherence of information with said master control unit, each of said master control unit and said slave control unit having an operation processing module for executing a process corresponding to a requested operation when receiving an operation instruction from said computer system,wherein upon transmission of the operation instruction from the computer system to said master control unit, the master control unit activates a corresponding operation processing module and the operation processing module of said slave control unit, subsequently starts the execution of an operation process of said master control unit, and simultaneously transmits parameter data of said operation instruction to said slave control unit, thereby realizing a double execution of the process,wherein said master control unit includes a queue to store said operation instruction and when the operation processing module of said master control unit receives the operation instruction from said computer system, said operation instruction is stored into said queue, and the parameter data is subsequently transferred between said master control unit and said slave control unit, andwherein the master control unit starts the self operation process and instructs the slave control unit to start the operation process when said operation instruction is stored into the queue.

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