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Method for processing RAID5 (Redundant Array of Independent Disks) bad sector

A bad sector and sector technology, applied in the field of RAID5 bad sector processing, can solve problems such as abnormal loss and disk array failure, and achieve the effect of increasing reliability and reducing repair time.

Active Publication Date: 2012-06-20
LANGCHAO ELECTRONIC INFORMATION IND CO LTD
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  • Abstract
  • Description
  • Claims
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AI Technical Summary

Problems solved by technology

In addition, if a stripe has a bad sector, BSR can be done, but if two disks in a stripe have bad sectors, BSR cannot be done, and the disk array may be damaged due to the existence of several disks. bad sector
This loss is not normal if other sectors are normal

Method used

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  • Method for processing RAID5 (Redundant Array of Independent Disks) bad sector
  • Method for processing RAID5 (Redundant Array of Independent Disks) bad sector
  • Method for processing RAID5 (Redundant Array of Independent Disks) bad sector

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Embodiment Construction

[0018] The method of the present invention is described in detail below with reference to the accompanying drawings.

[0019] The processing steps are as follows: First, create a sector mapping table. Each item in the table includes the original sector number and the newly mapped sector number. This table can be placed in the reserved space of the disk, and it can be placed in the memory when used. In addition, there is a counter remap to record how many strips have been mapped.

[0020] When there is a sector write error, record which disk has the bad sector, and increase the bad sector count of the disk. Regardless of whether the stripe has data that has been written before, the stripe must be rewritten, marked, written to the reserved space, and the original sector number and the newly mapped sector number are filled in the sector mapping table. Reserved space is written in chronological order. Every time the reserved space is written, the remap position is increased by ...

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Abstract

The invention provides a method for processing RAID5 bad sector. The method comprises the following steps: transferring a stripe with a bad sector to a reserved region to prevent a small amount of bad sectors of a disk from influencing use of a disk array; and backing up data of a certain disk to a hot spare when the number of bad sectors of the disk reaches an alarm value firstly, thereby enhancing reliability of the disk array.

Description

technical field [0001] The invention relates to the field of computer systems and storage, in particular to a method for processing RAID5 bad sectors. Background technique [0002] For the RAID5 system with redundant check information, the fault tolerance function has become the most popular feature of the disk array. In order to strengthen the fault tolerance function and enable the system to quickly rebuild data in the case of a disk failure, in order to maintain system performance, generally All disk array systems can use the function of hot backup. The so-called hot backup is to designate one of the disks as a backup disk when the disk array system is established. This disk is not normally operated, but if a disk in the array occurs When a failure occurs, the disk array replaces the failed disk with a backup disk, and automatically rebuilds the data of the failed disk on the backup disk. The RAID5 system allows only one disk to fail, and when the second disk fails, the ...

Claims

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Application Information

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IPC IPC(8): G06F3/06
Inventor 古世磊施培任
Owner LANGCHAO ELECTRONIC INFORMATION IND CO LTD
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