Error detection/correction and fault detection/recovery – Data processing system error or fault handling – Reliability and availability
Patent
1998-05-11
2000-02-01
Beausoliel, Jr., Robert W.
Error detection/correction and fault detection/recovery
Data processing system error or fault handling
Reliability and availability
714 8, G06F 1100
Patent
active
060215097
ABSTRACT:
A method for rebuilding contents of a malfunctioned direct access storage device within a log-structured array is disclosed. In accordance with the method and system of the present invention, each direct access storage device within a log-structured array is divided into multiple segment-columns, and each corresponding segment-column from each direct access storage device within the log-structured array forms a segment. A segment is first located within the direct access storage devices. A determination is made as to whether or not the segment is empty. In response to a determination that the segment is empty, a pointer is moved within a segment-column mapping table from pointing to a segment-column in the malfunctioned direct access storage device to point to a segment-column in a spare direct access storage device of the segment. In response to a determination that the segment is not empty, rebuilding contents of the segment-column in the malfunctioned direct access storage device to the segment-column in the spare direct access storage device, and moving the pointer within the segment-column mapping table from pointing to the segment-column in the malfunctioned direct access storage device to point to the segment-column in the spare direct access storage device of the segment. The process then returns to the determination step until all segment-columns within the malfunctioned direct access storage device are rebuilt.
REFERENCES:
patent: 5088081 (1992-02-01), Farr
patent: 5278838 (1994-01-01), Ng et al.
patent: 5390187 (1995-02-01), Stallmo
"Rebuild Only Used Space in Update-In-Place Array", IBM Technical Disclosure Bulletin, vol. 38 No. 06, Jun. 1995.
Gerdt Steven
Menon M. Jaishankar
Nguyen Dung Kim
Beausoliel, Jr. Robert W.
Dillon Andrew J.
International Business Machines - Corporation
Klein Esther E.
Ng Antony P.
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