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Data recovery method and device

A recovery method and data technology, which is applied in the direction of data error detection and response error generation, can solve the problems of long copying time and waste of bandwidth resources, and achieve the goal of reducing copying time and saving bandwidth resources. Effect

Active Publication Date: 2014-03-26
HUAWEI TECH CO LTD
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  • Description
  • Claims
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AI Technical Summary

Problems solved by technology

[0006] In the existing data recovery method in the ROW-based data storage system, whenever a data error occurs in the system and a snapshot is rolled back, all data in the primary storage device needs to be copied to the secondary storage device, which takes a long time to copy and wastes a lot of bandwidth. resource

Method used

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Embodiment Construction

[0082] In order to make the object, technical solution and advantages of the present invention clearer, the implementation manner of the present invention will be further described in detail below in conjunction with the accompanying drawings.

[0083] The solution provided by the present invention can be used in a storage system, such as figure 1 As shown, the storage system includes at least a first storage device and a second storage device, wherein the second storage device is a backup of the first storage device, and each time a user writes data in the first storage device, the first storage device Both send the written data to the second storage device for backup storage. In addition, the first storage device also periodically generates snapshots of the data in the first storage device, and each time a snapshot is generated is a snapshot time point, when the data in the first storage device fails, the first storage device can The snapshot established at the target snaps...

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Abstract

The invention discloses a data recovery method and device and belongs to the field of data storage. The method includes the steps of receiving a data recovery command which includes a target snapshot time point through a first storage device, confirming that data stored in a logic address are data written to the first storage device after the target snapshot time point, obtaining historical data, and sending the historical data and the logic address to a second storage device. By receiving the data recovery command which includes the target snapshot time point through the first storage device, confirming that the data stored in the logic address are the data written to the first storage device after the target snapshot time point, and sending the historical data and the logic address to the second storage device, the problem that in the prior art, all data in a main storage device are required to be copied to storage devices is solved, and the purposes that copy time is reduced, and broadband resources are saved are achieved.

Description

technical field [0001] The invention relates to the field of data storage, in particular to a data restoration method and equipment. Background technique [0002] ROW (Redirect On Write) is a very widely used data writing method. In the ROW-based data storage system, when the data corresponding to a certain logical address needs to be modified, the system will keep the data and its physical address unchanged, assign a new physical address for the modified data and write it; the management personnel Regularly create snapshots for the currently stored data. When the data in the system fails, the system can roll back the snapshots according to the instructions of the administrator, and update the data corresponding to each logical address to the data at the point in time when the target snapshot was created, thereby restoring the data. to the state when the target snapshot was created. [0003] At the same time, in order to avoid the loss of local data due to natural disaster...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F11/14
Inventor 李大权欧阳戟
Owner HUAWEI TECH CO LTD
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