| 摘要 |
One aspect includes a disk array having a mirror configuration to rebuild. The disk array includes a buffer to temporarily store data (data X) in a read or write request from a host (read/write request), a redundant first disk and second disk having a mirror configuration, and an auxiliary disk. A redundancy management table logs disk locations of data stored in the first disk and copied to the auxiliary disk. A controller controls reading and writing of data X between the buffer and two redundant disks in response to a request. The controller is configured to: (a) copy to the auxiliary disk, data X stored in the buffer for rebuilding, in parallel with reading and writing data X, when the second disk fails; (b) log, in the redundancy management table, copied disk locations of data X copied in (a); and (c) return a response to the host after copying completion. |
