| 摘要 |
A computer system enable system operation by hiding the peculiarity of an upstream port of a switch in a computer system in which a plurality of CPU units are interconnected by a PCI Express switch. When a CPU unit, which is connected to the upstream port of a serial connect switch interconnecting the plurality of CPU units, is unable to operate, and the links between the CPU units and the switch cannot be established, a management controller in the switch unit is selected as a device of the upstream port.
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