| 摘要 |
To reduce the performance degradation of storage system, this invention provides a storage system comprising a disk drive and a disk controller. The disk controller provides a storage area of the disk drive to a host computer; executes a processing of switching an encryption key that is used to encrypt data stored in the logical volume from a first encryption key to a second encryption key; encrypts write data requested to be written with the second encryption key when the write request for one of storage areas within the logical volume that stores data for which switching of encryption keys has not been finished is received while the encryption key switching processing is being executed; and writes the encrypted write data in the logical volume to switch encryption keys for data stored in the storage area where the data is requested to be written by the received write request. |
