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Method and device used for RAID (Redundant Array of Independent Disks)

An independent disk redundancy and disk technology, which is applied in the field of storage systems to save reconstruction time and achieve flexible reconstruction.

Active Publication Date: 2017-04-05
EMC IP HLDG CO LLC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] In view of the above-mentioned problems in the prior art, the purpose of the embodiments of the present disclosure is to provide a method and device for redundant array of independent disks RAID, so as to solve the above-mentioned and other problems in the prior art

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  • Method and device used for RAID (Redundant Array of Independent Disks)

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Embodiment Construction

[0041] The principle and spirit of the present disclosure will be described below with reference to several exemplary embodiments shown in the accompanying drawings. It should be understood that these specific embodiments are described only to enable those skilled in the art to better understand and realize the present disclosure, rather than to limit the scope of the present disclosure in any way.

[0042] figure 1 The layout of data and metadata of an example RAID is schematically shown. Such as figure 1 As shown in , in products such as EMC's VNX2, users can create a redundant array of independent disks RAID on multiple disks. The disk space of the RAID can be divided into chunks, and the size of each chunk can be 1 megabyte. Further, RAID can define metadata to describe block status, such as information requiring reconstruction, and can store the metadata in an area at the end of each disk. The data zone and metadata zone can use the same RAID geometry and algorithm. ...

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Abstract

The content of the invention provides a method and a device used for a RAID (Redundant Array of Independent Disks). The method comprises the following steps of: dividing the RAID into a plurality of sub-RAIDs; generating sub-RAID metadata corresponding to each sub-RAID; and responding when one disk in the RAID is replaced, and reconstructing data in the corresponding sub-RAID on the basis of each piece of sub-RAID metadata. The content of the invention also provides a computer-readable storage medium and a storage system.

Description

technical field [0001] The present disclosure relates generally to a storage system and method, and more particularly to a method and apparatus for redundant array of independent disks (RAID). Background technique [0002] Among disks that can constitute a redundant array of independent disks RAID, several kinds of disks have inferior performance but have large capacities, such as NL-SAS disks. As a result, when a RAID including NL-SAS disks is degraded, the reconstruction for new disks will take a long time, even days. In this situation, the RAID stays in a dangerous state (potential data unavailability / data loss) for an excessively long period of time, because any failure of any other disk from this RAID will result in corruption of the entire RAID (if the RAID is a RAID- 5 types). All data from this RAID will be unavailable. In summary, when the RAID is in a degraded state, customers will frequently encounter the risk of data unavailability. [0003] However, the RAID...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F3/06
CPCG06F11/1092G06F11/2094G06F11/1076G06F11/2056G06F11/2053G06F11/1662G06F2201/805G06F2201/82
Inventor 高宏坡高健肖会兵董继炳韩耕
Owner EMC IP HLDG CO LLC
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