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RAID (redundant array of independent disk) and method for reading data from same

A technology for reading data and reading data, which is applied in the storage field and can solve problems such as performance degradation, large occupation, and extended host IO processing time, so as to achieve the effect of reducing bandwidth and ensuring correct recovery

Active Publication Date: 2015-03-25
HUAWEI TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Among them, the large amount of data written in the initial IO will occupy a large amount of hard disk write bandwidth, resulting in prolonged IO processing of the host, resulting in performance degradation

Method used

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  • RAID (redundant array of independent disk) and method for reading data from same
  • RAID (redundant array of independent disk) and method for reading data from same
  • RAID (redundant array of independent disk) and method for reading data from same

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Embodiment Construction

[0018] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

[0019] See figure 1 as shown, figure 1 is a schematic structural diagram of the storage device 20 according to the first embodiment of the present invention. Such as figure 1 As shown, the storage device 20 described in this embodiment includes a storage controller 21 and a hard disk 22 . Wherein, the storage controller 21 includes a processor 211 , a communication interface 212 and a memory 213 , the memory 213 includes a RAID module 214 an...

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Abstract

The invention discloses an RAID (redundant array of independent disk) and a method for reading data from the same. The method includes: receiving or generating a data reading command including an address of target data; judging whether or not the address of the target data is included in a pre-created uninitialized LOG which is used for recording an address of an uninitialized storage space in the RAID; if the address of the target data is included in the pre-created uninitialized LOG, returning data 0 to a host. By the mode, the bandwidth of a hard disk needed for RAID initialization can be narrowed, and correct recovery of the data of the RAID is ensured.

Description

technical field [0001] The invention relates to the technical field of storage, in particular to a RAID and a method for reading data therefrom. Background technique [0002] In the storage system, Redundant Array of Independent Disk (RAID) is a redundant array composed of multiple cheap disks. RAID can give full play to the advantages of multiple hard disks, improve the speed of hard disks, increase High capacity. [0003] The method for writing data in the RAID of the prior art specifically includes: first the RAID module obtains a write data request from the host, and the initialization module sends a formatted all-0 data write IO (Input / Output) to the RAID module; then the RAID module issues the initialization IO, The RAID module sends the host IO; the hard disk returns the writing success to the RAID module, and the RAID module notifies the initialization module that the initialization is complete, and notifies the host that the writing is complete. Among them, the la...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F3/06G06F12/02
CPCG06F3/061G06F3/0689
Inventor 李大权薛强
Owner HUAWEI TECH CO LTD