Error detection/correction and fault detection/recovery – Data processing system error or fault handling – Reliability and availability
Reexamination Certificate
2008-04-01
2008-04-01
McCarthy, Christopher (Department: 2113)
Error detection/correction and fault detection/recovery
Data processing system error or fault handling
Reliability and availability
C711S114000
Reexamination Certificate
active
07353423
ABSTRACT:
A system for improving a performance of a write process in an exemplary RAID system reduces a number of IOs required for a short write in a RAID algorithm by using a replicated-parity drive. Parity is stored on the parity portion of the disk drives. A replicated-parity drive comprises all the parity information. Parity information for each parity drive is co-located or mirrored on the replicated-parity portion of the disk drives for fast access during a read portion of the read-modify-write process. Consequently, the system accesses parity data with one seek, as opposed to P seeks in a conventional disk array system utilizing P parity drives.
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“IBM Technical Disclosure Bulletin,” vol. 36 No. 03, Mar. 1993.
“IBM Technical Disclosure Bulletin,” vol. 37 No. 02A, Feb. 1994.
Hafner James Lee
Hartline Jeffrey R.
Kanungo Tapas
Fleit Kain Gibbons Gutman Bongini & Bianco P.L.
Gibbons Jon A.
International Business Machines - Corporation
Kassatly Samuel A.
McCarthy Christopher
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