Rapid reconstruction method and device of RAID (Redundant Array of Independent Disk) system

A fast, bitmap technology, applied in response to error generation, redundant code for error detection, input/output to record carrier, etc., can solve problems such as not necessarily efficient, and achieve the effect of improving IO performance and reliability

Inactive Publication Date: 2010-09-22
UNITED INFORMATION TECH +1
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

Doing a full rebuild operation for a RAID with failed disks is absolutely safe, but not necessarily efficient

Method used

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  • Rapid reconstruction method and device of RAID (Redundant Array of Independent Disk) system
  • Rapid reconstruction method and device of RAID (Redundant Array of Independent Disk) system
  • Rapid reconstruction method and device of RAID (Redundant Array of Independent Disk) system

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Embodiment Construction

[0067] The basic idea of ​​the technical solution of the present invention is:

[0068] A, the initial value is set to an invalid bitmap (bitmap), and each bit in the bitmap corresponds to at least one stripe in the RAID system;

[0069] B. When writing a strip, modify the bits of the bitmap corresponding to the strip to be valid;

[0070] C. Find the stripes that have been written according to the bitmap, and restore the data of the found stripes.

[0071] In the technical solution of the present invention, a bitmap is used to record which strips have been written since the RAID system was created, so that when the reconstruction operation must occur, only the areas corresponding to these strips are repaired. Preferably, The bitmap is saved on a non-volatile random access memory (Non-Volatile Random Access Memory, NVRAM) as RAID system metadata, so that the bitmap information can be restored when the system is restarted. This fast reconstruction method greatly improves the ...

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Abstract

The invention discloses a rapid reconstruction method of a RAID (Redundant Array of Independent Disk) system. The method comprises the following steps of: A, setting a bitmap, the initial value of which is invalid, wherein each bit in the bitmap corresponds to at least a strip in the RAID system; B, modifying the bit of the bitmap corresponding to the strip into valid when the writing operation is carried out on the strip; and C, finding out the strip on which the writing operation is carried out according to the bitmap, and recovering the data of the found strip. The invention also discloses a rapid reconstruction device of the RAID system. The RAID system reconstruction can be rapidly realized according to the scheme of the invention, and the IO (Input/Output) performance and the reliability of the system can be improved.

Description

technical field [0001] The present invention relates to the technical field of computer storage, in particular to redundant array of independent disks (Redundant Array of Independent Disks, RAID) technology, and in particular to a rapid reconstruction method and device for a RAID system. Background technique [0002] As the foundation and key component of the network storage system, RAID is famous for its fast speed, large volume and high reliability. After the emergence of RAID technology, the application requirements in various fields such as industry, military affairs, and education are very extensive, and the research on RAID technology has always been a hot spot in the industry. [0003] The hot spare disk is used as a backup under normal circumstances, not for data storage. Only when a hard disk in the RAID system is damaged, it will automatically replace the failed disk and be used to store data, which improves data security and achieves safety redundancy. By adding ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F11/10G06F3/06
Inventor 鲍清平饶国林
Owner UNITED INFORMATION TECH
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