G - Physics – 06 – F
Patent
G - Physics
06
F
G06F 11/16 (2006.01) G06F 11/10 (2006.01) G11B 20/18 (2006.01) G11C 29/00 (2006.01) G06F 11/14 (2006.01)
Patent
CA 2053692
ABSTRACT A method for on-line reconstruction of a failed storage unit in a redundant array system, After providing a replacement storage unit for the failed storage unit,reconstruction begins for each data stripe in the array. General reconstructionconsists of applying an error-correction operation (such as an XOR operation on data blocks and a corresponding parity block) to the data blocks from the remain- in storage units in the redundancy group, and storing the result in the corre- sponding block of the replacement storage unit. If a Read operation is requested by the CPU for a data block on the replacement storage unite, then a concurrent Read task is executed which reconstructs the stripe containing the requested data block. If a Read operation is requested by the CPU for a data block not on the replacement storage unit, a concurrent Read task is executed which performs a normal Read. If a Write operation is requested for any data block, then a concurrent Write task is executed which performs a Read-Modify-Write sequence in the general case (the Read operation being performed in accordance with the above rules).
Emc Corporation
Oyen Wiggs Green & Mutala Llp
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