| 摘要 |
Data is updated while making sure that one logically meaningful data group is set as the unit of data update. Provided is a data input/output method including: a first step of requesting the first disk controller a data input/output request to/from the logical volume of the first disk drive, by the host computer; a second step of storing, when the input/output request is an update request, update data requested by the update request in the first logical volume, by the first control unit; a third step of sending the update request to the second disk controller, by the first control unit; a fourth step of temporarily accumulating, when information indicating to which group update data belongs is attached to the update request sent from the first control unit, the update data requested by the update request, by the second control unit; and a fifth step of retrieving, when the first disk controller finishes executing every data input/output request that is designated by the information indicating to which group update data belongs, the accumulated update data for those belonging to the same group according to the information indicating to which group update data belongs and storing the retrieved update data in the second logical volume, by the first control unit.
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