Single-disk redundant array of independent disks (RAID)
First Claim
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1. An erasure correction method comprising:
- determining a plurality of erasure groups on a single disk, each erasure group comprising a plurality of data values and erasure codes; and
computing checksums of the data values of the erasure groups.
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Abstract
The vulnerable interval between the occurrence of a localized or spot failure and the occurrence of a detectable disk failure is reduced by providing redundancy within a single disk. Sectors of the disk may be grouped into independent sets. Error-correcting or erasure-correcting codes may be applied across groups of sectors where the maximum number of failures prior to detectable disk failure is expected to be small. It is desirable to place all sectors in adjacent tracks in different redundancy groups. This provides a lower bound on the number of redundancy groups needed.
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Citations
20 Claims
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1. An erasure correction method comprising:
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determining a plurality of erasure groups on a single disk, each erasure group comprising a plurality of data values and erasure codes; and
computing checksums of the data values of the erasure groups. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A method for reducing redundancy in a storage system, comprising:
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grouping a plurality of sectors of a single disk into independent sets; and
applying erasure-correcting codes across the sets of sectors. - View Dependent Claims (11, 12, 13)
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14. An erasure correction system comprising:
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a processor for determining a plurality of erasure groups on a single disk, each erasure group comprising a plurality of data values and erasure codes, and for computing checksums of the data values of the erasure groups; and
a storage device for storing the checksums in storage as erasure correction values. - View Dependent Claims (15, 16, 17, 18, 19, 20)
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Specification