Hitachi, Ltd.

Shinichiro Toya

Keitaro Uehara

Takashi Aoyagi

Keishi Nakayama

To make it possible to take over an IO configuration that is assigned to logical partitions in reallocation of the logical partitions, and to make an IO access work normally. A computer system has a server having an IO bridge, a switch that has a first IO bridge for connecting with the IO bridge of the server through a bus and plural second IO bridges for connecting to plural IO devices through a bus, and bus number assignment management means for fixedly assigning mutually different PCI bus numbers to the plural second IO bridges.

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Tokyo, Japan

Shinichiro Toya