| 摘要 |
In order to realize duplicating of data even if a host apparatus, for example, modifies a part of commands to simplify a recovery process in the recovery process, a primary file unit issues a command similar to a writing operation directive command to a secondary file unit when accepting the write operation directive command from the host apparatus, directs to start the writing, and transfers writing start location information. Each time the primary file unit receives one of a series of write commands from the host apparatus after the writing operation directive command, the primary file unit issues a command similar to the write command to the secondary file unit to direct the writing, and transfers the data. When the write data is normally written in the secondary file unit, the primary file unit notifies the host apparatus of normal termination.
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