Method and device for processing metadata

Abstract

The invention discloses a method and a device for processing metadata. The method comprises the following steps of: copying data written for the first time in an original disk space into a snapshot backup data area according to copy-on-write operation, establishing metadata and bitmap corresponding relationships and calculating a first address of a metadata bitmap area where the metadata belongs and metadata position indexes of the metadata in the metadata bitmap area according to the bitmap corresponding relationships; judging whether the first address is the same as a preset allocation marker bit or a deletion marker bit or not to obtain a comparison result and setting bitmap mapping bits; and according to the comparison result, the first address of the metadata bitmap area where the metadata belongs, and the metadata position indexes, storing the metadata into corresponding position indexes of an allocation control buffer area or a deletion control buffer area, or writing all the metadata in the allocation control buffer area into corresponding positions of the metadata bitmap area or deleting all the metadata in the deletion control buffer area from the corresponding positionsof the metadata bitmap area.

Description

technical field [0001] The present invention relates to the field of snapshots, in particular to a metadata processing method and device. Background technique [0002] At present, with the rapid development of network storage and data storage, data management and data security have become particularly important. The surge in the amount of user data not only brings a large demand for online storage devices, but also puts forward higher requirements for online data protection. Snapshot (Snapshot) is one of the effective technologies to prevent data loss of online storage devices. [0003] In the prior art, a snapshot is a fully available copy of a specified data set, and the copy includes an image of the corresponding data at a certain point in time, that is, the point in time when the copy starts. A snapshot can be a copy or a replica of the data it represents. When an application failure or file damage occurs on the storage device, the snapshot function can be used to res...

AI Technical Summary

Problems solved by technology

[0016] The present invention provides a metadata processing method and device, which are used to solve the problem in the prior art that the metadata writing operation cannot satisfy the dynamic allocation strategy of the unified space on-demand allocation and the frequent times of writing to the hard disk

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