| 摘要 |
<p>A storage system (1) has a plurality of control modules (4-0 - 4-3) for controlling a storage device (2-0 - 2-n) for accesses from a mainframe host and an open system host respectively supporting different protocols. An open channel adaptor (41) and a mainframe channel adaptor (44) are separately provided. The mainframe channel adaptor (44) is connected to a plurality of control managers (40) via front routers (6-0, 6-1) and performs parallel write access from the mainframe host for mirroring. In the write processing for the mainframe host, the connection is maintained until the completion of processing. In particular, even in case of a write miss, disk read processing can be performed in parallel, thus contributing to the high-speed processing in case of the write miss. Further, for an access from the open system host, a high throughput can be obtained.
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