Quick single-disk failure recovery method for triple-erasure-correcting codes

A technology of invalid data and single data, which is applied to the redundancy of hardware for data error detection and response error generation. It can solve the problems of repeated data reading and slow reconstruction speed, so as to improve the reconstruction speed and reduce I /O, the effect of short time consumption

Active Publication Date: 2014-10-22
HUAZHONG UNIV OF SCI & TECH
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Problems solved by technology

[0006] Aiming at the defects of the prior art, the purpose of the present invention is to provide a rapid reconstruction method based on the three-disk failure erasure code in the case of a single data disk failure, aiming to solve the slow reconstruction speed when the existing reconstruction method faces a single disk failure ,

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  • Quick single-disk failure recovery method for triple-erasure-correcting codes
  • Quick single-disk failure recovery method for triple-erasure-correcting codes
  • Quick single-disk failure recovery method for triple-erasure-correcting codes

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Embodiment Construction

[0027] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention.

[0028] At first provide the definition of relevant concept of the present invention:

[0029] Stripe: In erasure coding, a strip is an independent encoding and decoding unit, which is composed of different strip units scattered on different disks.

[0030] Data block: one or more adjacent blocks on the data disk, storing data information; data block D l,s Indicates the data block located in row l and column s in the stripe, 0≤l

[0031] Check block: one or more adjacent blocks on the check disk, storing check information.

[0032] Stripe unit: t...

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Abstract

The invention discloses a quick single-disk failure recovery method for triple-erasure-correcting codes. The method includes: dividing each stripe unit of each stripe into p-1 sub-blocks during recovery of single stripes; acquiring a total number R<idea1> of the sub-blocks, used for recovering a failed disk, in each stripe; in an array of p+2 disks, initializing a feasible solution value for failure of the failed disk I into 3<p-1>; initializing a counter j=0; converting j into a recovered sequence which is ternary and which shares p-1 elements by means of the division algorithm; calculating a sum of bits with 0, 1 and 2 values in the recovered sequence of p-1 bits; comparing the three numbers pairwise; judging whether or not absolutes of differences are all smaller than or equal to 1; if yes, starting an effectiveness test function and judging whether or not test blocks, represented with the recovered sequence, are able to recover all data blocks in the failed disk i. The letter p is a prime number, with p+2 being equal to the number of disks in an RAID (redundant array of independent disks), and R<idea1>=R<low>+w%. The quick single-disk failure recovery method for triple-erasure-correcting codes has the advantages that disk recovery process can be quickened and system reliability is improved.

Description

technical field [0001] The invention belongs to the field of computer storage systems, and more specifically relates to a single-data-disk-failure rapid reconstruction method with three-disk failure erasure codes. Background technique [0002] Modern storage systems use redundant information such as error correction codes to ensure data availability and improve system reliability. The storage system can be a disk array composed of multiple disks, or a super-large-scale cloud storage system, such as the Windows Azure Storage (WAS for short) developed by Microsoft, which supports many applications such as social network search and so on. application. For a long time, researchers have spent a lot of time and energy studying various RAID6 encodings, including RDP encoding, EVENODD encoding and so on. [0003] figure 1 It represents a three-disk error-tolerant storage system composed of disk arrays. Here, each node is a disk, and the space of all disks is divided into blocks (...

Claims

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Application Information

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IPC IPC(8): G06F11/16
Inventor 王芳冯丹邱丽娜李楚
Owner HUAZHONG UNIV OF SCI & TECH
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