| 摘要 |
A disk drive array includes a plurality of disk drives (28-0 to 28-n) in an input interface (24) for receiving data records from a data processing system (10). The input interface (24) organises each data record received in the data sectors for storage on the disk drives, identifies a plurality of sectors as a related group and generates a parity sector for the group, where each data and parity sector includes an appended error correction code. The groups of data and parity sectors are stored by striping across the available disk drives. A data recovery channel according to the present invention comprises: a disk drive controller (30-0 to 30-n) associated with each disk drive (28-0 to 28-n); a data buffer (32-0 to 32-n) retaining the data and parity recovered with each sector; an error status buffer (38-0 to 38-n) retaining indication of non-zero error syndromes generated upon recovery of a sector or occurrence of a disk fault associated with attempted recovery of a sector; an error syndrome buffer (36) for retaining any non-zero error syndromes generated during recovery of data and parity sectors; syndrome processing circuitry (42) connected to the error syndrome buffer for determining the correctability of the data of a sector, and for correcting the data in the data buffers, if possible; parity correction circuitry (40) receiving associated groups of data and parity information from the data buffers and correcting the data from up to one sector; and an array controller (34) operating upon the error status buffer and indications of correctability of data from the syndrome processing circuitry to direct the correction method for each sector of a group. <IMAGE> |
