| 摘要 |
A computer system comprising a host computer and a first storage system coupled to the host computer. The first storage system includes a first controller for controlling the first storage system, a first volume for storing data written by the host computer and a second volume for storing updated data when the data stored in the first volume is updated The first controller generates update information based on write data contained in the write request upon reception of a write request from the host computer, encrypts the write data based on an encrypted status of the data stored in the second volume and an encryption key for encrypting the data stored in the second volume and stores the generated update information and the encrypted write data in the second volume.
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