System control apparatus including a master control unit and a slave control unit which maintain coherent information
First Claim
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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Accused Products
Abstract
In the master control unit, updated information is transferred to a slave control unit and a coherence of information between the master control unit and the slave control unit is periodically checked, thereby eliminating a difference of the internal information of the two units which execute a control, a status monitor, and a maintenance of a computer system in an on-line manner and guaranteeing the coherence. When the master control unit recognizes a difference between the information for a predetermined time or more, the slave control unit is halted and the information of the master control unit is made effective. With respect to an abnormality of the master control unit, the master control unit halts by itself. In this instance, the slave control unit is shifted to the master status and takes over the process.
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Citations
20 Claims
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1. A system control apparatus, comprising:
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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, and wherein 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. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20)
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Specification