Data recovery method and device for bad sector of logic unit

Abstract

The embodiment of the invention provides a data recovery method and device for a bad sector of a logic unit. The method comprises the following steps: a host computer inquires a bad sector of a logic unit from a hardware array; the host computer receives identification information of the bad sector of the logic unit, transmitted by the hardware array; and the host computer recovers data stored in the bad sector of the logic unit according to the identification information of the bad sector of the logic unit. In the embodiment of the invention, the host computer can be used for actively recovering the data stored in the bad sector of the logic unit, so that the problem that the data stored in the bad sector of the logic unit cannot be passively recovered until access to the bad sector of the logic unit is triggered by the host computer through a service in the prior art is solved, and the recovery timeliness is enhanced.

Description

technical field [0001] The invention relates to communication technology, in particular to a data recovery method and device for a bad sector of a logic unit. Background technique [0002] Redundant Array of Independent Disk (RAID), also referred to as Disk Array for short, is a hard disk group formed by combining multiple independent hard disks (physical hard disks) in different ways ( logical hard drive). The hard disk array can use striping (striping) technology to distribute data to each hard disk. Each strip can be regarded as a logical unit (LogicalUnit, referred to as LU), which can be represented by a logical unit number (Logical Unit Number, referred to as LUN). To identify. Each logical unit is distributed to a continuous block (block), and the data is divided into several blocks ranging from 512 bytes to several megabytes, and then written to each hard disk respectively. The hard disk array can use the redundant data in the stripe (ie, the redundant data in the...

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Problems solved by technology

[0003] However, if the hard disk array does not have redundant data stripes, for example, when one hard disk fails in RAID 5, another failed hard disk cannot be repaired, or RAID 0 itself does not have redundant data stripes, etc. Then the damaged data in the stripe cannot be repaired, and there will be a bad sector corresponding to the damaged data, that is, a logical unit bad sector

When the host accesses the bad sector of the logical unit triggered by business, the bad sector of the logical unit can be found and repaired, thus reducing the timeliness of repair

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