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Method and device for recovering data by employing snapshot

A technology for recovering data and data. The redundancy applied in the operation is used for data error detection and response error generation. It can solve the problem of wasting snapshot volume storage space, and achieve the effect of saving snapshot volume space.

Inactive Publication Date: 2009-04-29
NEW H3C TECH CO LTD
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  • Claims
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Problems solved by technology

In this way, the data can be restored to a certain moment in the middle, instead of having to be restored to the original moment; however, in the process of data restoration using this method, if the current moment and the moment to be restored are not in the same time period, It is necessary to store the replaced data in the data volume in the snapshot corresponding to the current time period. This part of the data is stored repeatedly, such as figure 2 After recovering to the state at 9:00, the data in the 9:00 snapshot and the 10:00 snapshot are repeatedly stored in the 11:00 snapshot. Obviously, this method wastes the storage space of the snapshot volume

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  • Method and device for recovering data by employing snapshot
  • Method and device for recovering data by employing snapshot
  • Method and device for recovering data by employing snapshot

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Embodiment Construction

[0034] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0035] The method provided by the present invention is an improvement on the second method in the prior art. The method of forming a snapshot during normal write operations is the same, and the present invention improves the processing method of the snapshot during the data recovery process. , adding another form of snapshot. In order to distinguish, the snapshot formed during the normal write operation is called a regular snapshot, and the snapshot formed during the data recovery process is called a rollback snapshot.

[0036] The method provided by the present invention will be described in detail below in conjunction with specific examples. image 3 The detailed method flow chart provided for the embodiment of the present invention. In this em...

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Abstract

The invention provides a method for recovering data by snapshot and a device thereof. In the method, after conventional snapshots at an extreme end are written in a corresponding resource block of a data volume, the used conventional snapshots are deleted in time, and during the subsequent data recovery process, every time a rollback operation is executed by the conventional snapshots, i.e., after the data in the conventional snapshots are written in the corresponding resource block of the data volume, the used conventional snapshots are deleted in time and a rollback snapshot is established accordingly to store the replaced data in the resource block of the data volume so as to ensure that the state which is rolled back can be recovered again. The method and the device can help occupy less snapshot resources and save more snapshot volume space.

Description

technical field [0001] The invention relates to the technical field of data protection, in particular to a method and device for recovering data by using a snapshot. Background technique [0002] With the wide application and continuous development of information science and technology, data protection becomes more and more important. In order to quickly back up data without interrupting host services, snapshot technology emerges as the times require. Generally, the resources for reading and writing are called data volumes, and the resources added by implementing snapshots are called snapshot volumes. During the snapshot process, data processing is usually performed in units of data blocks. [0003] The core principle of the original snapshot method is Copy On First Write (COFW). After creating a snapshot for the data volume at a certain point in time, when writing to the data volume, if the resource to be written If the data in the block changes for the first time, the da...

Claims

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Application Information

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IPC IPC(8): G06F11/14
Inventor 孙策杨西平周迪
Owner NEW H3C TECH CO LTD
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