| 摘要 |
A mainframe system disk control unit is provided with apparatus for accessing open system storage connected to a SAN and apparatus for converting the input and output data format to that of the open system, and the mainframe is made to access a volume of open system storage in the same manner to a volume under control of the mainframe system disk control unit. Thus, data in the open system storage is backed up to the mainframe system. Communication is performed between the program on the mainframe and the program on the open system host computer, and prior to starting backup, the updating of data in the open system storage system is prohibited.
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