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US 2006/0224914 A1Published application
RAID system using regional error statistics for redundancy grouping
AssigneeHitachi Global Storage Technologies Netherlands B.V.
InventorsMario Blaum, Roger Hoyt
Life of this patent
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Abstract
Geometrically-dependent error rates are used to identify sectors for XORing data in a RAID system for parity purposes in such a way that the probability of failure of any particular group is minimized.
Claims20
RAID-implemented software embodying logic comprising:
- associating at least a first error statistic with a first geometric disk location;
- associating at least a second error statistic with a second geometric disk location;
- and
- rendering, based on the error statistics, at least one parity output by combining data on a first disk in the first geometric disk location with data on a second disk in the second geometric disk location to minimize the probability of failure of a data group.
1 more element
A RAID controller executing logic to store data in plural storage disks, the logic comprising:
- receiving at least two error informations respectively associated with two geometric disk regions, the error informations at least indicating different error rates from each other;
- and
- using the error informations to execute at least one RAID operation.
A disk drive controller, comprising:
- means for associating a first error statistic with a first disk region and a second error statistic with a second disk region;
- means for combining data from a first region on a first disk at least with data from a second region on a second disk;
- and
- means for identifying the first and second regions using the first and second error statistics.
1 more element
Dependencies are inferred from the claim text.