摘要 |
PURPOSE: A method and apparatus for monitoring the opposite system in a duplex system are provided to accurately recognize a fault part occurring during operation of a system by continuously performing mutual monitoring of the system through an SCSI(small computer system interface) bus and a network channel and minimize a load according to a network protocol in the mutual monitoring. CONSTITUTION: The first and the second systems(14,16) are connected through an interface to a service network(13). The first and the second systems(14,16) share a common disk(18) through the first and the second SCSI bus. A specific CPU board and the SCSI control boards of the first and the second systems(14,16) are connected by the SCSI bus. In the SCSI control board, an instruction word analyzer analyzes an instruction word transmitted through the SCSI bus, An SCSI instruction word transmitter transmits the SCSI instruction word transmitted from the instruction word analyzer through the SCSI bus to the opposite system, A state information collector collects the state of the opposite system by the SCSI instruction word transmitter and transmits it to the instruction word analyzer, and an internal state information collector collects its own system state and exchanges the information with the instruction word analyzer. A monitoring apparatus of the opposite system transmits an instruction word through the SCSI control board of the first system(14) so that the specific CPU can continuously monitor the state of the opposite system through the SCSI bus. The SCSI control board of the first system(14) share a common disk with the SCSI control board of the opposite system, that is, the second system connected through the SCSI bus to provide a service and perform a mutual monitoring operation.
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