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Method and device for protecting snapshot

A technology for protecting devices and snapshots, applied in the field of snapshot protection methods and devices, can solve the problems that production volumes cannot be restored to data, cannot be protected by snapshot data, and are disadvantageous.

Active Publication Date: 2007-12-26
HUAWEI TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] In the process of proposing the present invention, the inventors of the present invention found that the above-mentioned virtual snapshot technology has at least the following defects: the snapshot data cannot be protected, and once the user modifies the snapshot data, the production volume cannot be restored to the data at the original snapshot time point; And it is not conducive to meeting the requirements of some application scenarios, for example, the requirement that multiple application hosts simultaneously process snapshot data at a certain point in time, etc.

Method used

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  • Method and device for protecting snapshot

Examples

Experimental program
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Effect test

Embodiment 1

[0030] Embodiment 1. A snapshot protection method, the process of which is shown in FIG. 3 , including:

[0031] A1. Obtain an instruction to create a snapshot copy for the first snapshot.

[0032] The first snapshot in this embodiment has a general meaning, that is, a data object that stores data in an image manner. The first snapshot can be created directly from the production volume, or it can be a snapshot after the modification operation is performed; and if the created snapshot copy still retains the image-like data structure, that is, it can still be called a "snapshot", then the first A snapshot can also be a copy of another snapshot, which means that a copy of a copy of a snapshot can be instructed to be recreated.

[0033] The same snapshot can be instructed to create a snapshot copy one or more times, and the instruction to create a snapshot copy can be made at the beginning of creation of the first snapshot or at any time after creation. The specific method and t...

Embodiment 2

[0054] Embodiment 2. A snapshot protection method. Compared with the method of creating a snapshot copy by copying data provided in Embodiment 1, the difference is that the snapshot copy is created by copying the mapping table. The process is shown in Figure 5, including :

[0055] B1. Acquire an instruction to create a snapshot copy for the first snapshot.

[0056] For this step, refer to step A1 in Embodiment 1.

[0057] B2. According to the instruction of creating a snapshot copy, copy the mapping table of the first snapshot and create a second snapshot, use the copied mapping table as the mapping table of the second snapshot, and use the second snapshot as a copy of the first snapshot.

[0058] An example of this copy creation method is shown in Figure 6. In Figure 6, the first snapshot saves the data images A, B, C, and D of the production volume at a certain time, and the second snapshot is generated by copying the mapping table of the first snapshot as the second snaps...

Embodiment 3

[0076] Embodiment 3. A snapshot protection method. Compared with the method of creating a snapshot copy by copying data provided in Embodiment 1, the difference is that the snapshot copy is created by copying the mapping table and the resource volume. The process is shown in FIG. 9 display, including:

[0077] C1. Acquire an instruction to create a snapshot copy for the first snapshot.

[0078] For this step, refer to step A1 in Embodiment 1.

[0079] C2. Create a second snapshot by copying the mapping table and resource volume of the first snapshot according to the instructions for creating a snapshot copy, and use the second snapshot as a copy of the first snapshot; the specific steps include:

[0080] C21. Copy the mapping information in the mapping table of the first snapshot;

[0081] C22. Determine whether the address in the copied mapping information points to the resource volume of the first snapshot, if so, execute step C23; if not, continue to execute step C21, and...

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Abstract

A method for protecting snapshot sets up snapshot copy for snapshot and then executes operation separately on snapshot and snapshot copy. The protection device used for realizing said method is also disclosed.

Description

technical field [0001] The invention relates to the technical field of data protection, in particular to a snapshot protection method and device. Background technique [0002] With the wide application and continuous development of information science and technology, the amount of data is increasing rapidly, and data protection is becoming more and more important. In order to quickly generate a copy of the data object of the business application at a certain point in time without interrupting the host business, and occupy less storage space, a virtual snapshot technology has been proposed to perform a snapshot of the application data at a certain point in the business operation. backup. In this article, volumes that will provide data storage and access space for business applications are called production volumes. After the snapshot is created, the access to the snapshot can be performed simultaneously with the access to the production volume. When the production volume wa...

Claims

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Application Information

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IPC IPC(8): G06F11/14
CPCG06F11/1435G06F2201/84
Inventor 周升张鹏张国彬欧阳戟
Owner HUAWEI TECH CO LTD