Data snapshot backup method and device

Abstract

The embodiment of the invention discloses a snapshot backup method of data. The method comprises the following steps that: determining the category of respective basic data in the data of a plurality of virtual machines in a cloud platform; uniformly carrying out one-time snapshot backup on the basic data in the data of the virtual machine corresponding to same category of the basic data, and independently carrying out snapshot backup on respective discrepant data in the data of the virtual machine corresponding to the same basic data. The embodiment of the invention simultaneously discloses a snapshot backup device of the data.

Description

technical field [0001] The invention relates to data backup technology, in particular to a data snapshot backup method and device. Background technique [0002] figure 1 It is a schematic diagram of the storage data structure of the virtual machine, such as figure 1 As shown, for each virtual machine, the storage data is composed of the basic data part and the difference data part; wherein, the basic data part is the image data selected when the virtual machine is created, and the difference data part is the actual data of the virtual machine itself; based on Multiple virtual machines on the cloud platform created with the same image will share the same basic data part. The difference is that the difference data part maintains its own data. [0003] The current cloud platform adopts the method of full snapshot backup when snapshotting the storage data of the virtual machine. figure 2 Schematic diagram of the operation of using the full snapshot backup method for the stor...

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Problems solved by technology

[0003] The current cloud platform adopts the method of full snapshot backup when snapshotting the storage data of the virtual machine. figure 2 Schematic diagram of the operation of using the full snapshot backup method for the storage data of the virtual machine, as shown in figure 2 As shown, the current cloud platform has three virtual machines, which are virtual machine A, virtual machine B, and virtual machine C; the storage data of virtual machine A is composed of basic data A and difference data A1, and the storage data of virtual machine B is composed of Composed of basic data B and differential data B1, the storage data of virtual machine C is composed of basic data C and differential data C1; for each full snapshot backup, it is the basic data part and differential data of each virtual machine Perform full snapshot backup on the data part. Finally, the result of snapshot backup for virtual machine A is basic data A and differential data An, and the result of snapshot backup for virtual machine B is basic data B and differential data Bn. The result of the snapshot backup performed by machine C is basic data C and differential data Cn; when the cloud platform performs batch full snapshot backup, redundant data is often generated, which will lead to a surge in data volume and excessive disk read and write pressure. Reduced efficiency of snapshot backups

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