| 摘要 |
This storage system includes a server management unit for managing in a server a maximum overwrite count and an overwrite count for overwriting the overwrite data in a disk cache, a controller cache for temporarily storing overwrite data sent from the server in the storage subsystem, a storage management unit for managing a maximum overwrite count and an overwrite count for overwriting overwrite data sent from the server in the controller cache so as to overwrite overwrite data sent from the controller cache in the hard disk drive according to the number of the maximum overwrite count, and an address management unit for managing the respective addresses of the disk cache, the controller cache and the hard disk drive storing the same file to be erased.
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