Abstract: The system includes a PCI switch connecting a plurality of computers via a PCI interface; and a management server which controls assignment of PCI devices and computers connected to the PCI switch. The PCI switch reports an addition or change of a PCI device to the management server. The management server obtains basic information for the PCI device upon receipt of the report, determines an assignment state of the PCI device to either occupation or sharing, and instructs the PCI switch to assign the PCI device to the management server in the determined assignment state. The management server reads a driver of the PCI device connected through the PCI switch, and obtains detailed information of the PCI device through the driver.

Abstract: The system includes a PCI switch connecting a plurality of computers via a PCI interface; and a management server which controls assignment of PCI devices and computers connected to the PCI switch. The PCI switch reports an addition or change of a PCI device to the management server. The management server obtains basic information for the PCI device upon receipt of the report, determines an assignment state of the PCI device to either occupation or sharing, and instructs the PCI switch to assign the PCI device to the management server in the determined assignment state. The management server reads a driver of the PCI device connected through the PCI switch, and obtains detailed information of the PCI device through the driver.

Abstract: A control method of a computer system where a management server having configuration management information for managing I/O switches for connecting a plurality of computers with a plurality of I/O devices controls the allocation of the I/O devices for the computers where the management server acquires identifiers of a first computer and an I/O device that has been allocated to the first computer and stores them in the configuration management information, receives a switch from the first computer to a second computer, stops the first computer, allocates the I/O device that had been allocated to the first computer to the second computer, activates the second computer, and rewrites the identifier of a specific I/O device among the I/O devices that have been switched to the second computer to a pre-set virtual identifier.