Data backup and recovery method and device, and server

Abstract

The invention discloses a data backup and recovery method, a data backup and recovery device and a server. The backup method comprises the following steps: acquiring an original differential bitmap of a first target roll from a production end by a backup server; acquiring effective data of each fixed-length data block from the first target roll according to the original differential bitmap; storing the bitmap corresponding to the fixed-length data block including the effective into a fixed-length roll bitmap file of the fixed-length data block according to the original differential bitmap, wherein the fixed-length roll bitmap file is used for identifying the storage address of the effective data; storing the effective data of the fixed-length data block into the fixed-length roll file of the fixed-length data block. According to the data backup and recovery method, the data backup and recovery device and the server, the data transmission quantity between the production end and the server is reduced, the transmission speed is increased, and the storage space is saved.

Description

technical field [0001] The present application relates to the field of communications, in particular to a data backup and recovery method, device and server thereof. Background technique [0002] Currently, the backup of physical servers and virtual machines tends to be based on volume (that is, disk) level. Volume-level backup consists of full backup and incremental backup. [0003] When one of the volumes of the virtual machine to be backed up is backed up to the server for the first time, a full backup is performed to back up all data in the target volume to the server. During the second and subsequent backups, a differential backup is performed to back up the changed data in the target volume to the server. [0004] Among them, in order to facilitate data recovery, the storage format of the data to be backed up is usually fixed-length raw volume block data (the data to be backed up is divided into multiple block data of equal length). Both the virtual machine and the ...

AI Technical Summary

Problems solved by technology

Since the unchanged data (invalid data) in the fixed-length data block is also backed up to the server during backup, the amount of data transmission between the server and the virtualization platform is large, and the backup time is increased.

[0018] Moreover, when the first target volume of the virtualization platform to be backed up is a thinly provisioned volume, for the unallocated space of the virtualization platform, when the data of the first target volume of the virtualization platform to be backed up is backed up to the server, due to the volume The data is aligned according to the fixed length, which will cause the server to write invalid data

When restoring the data of the first target volume in the server to the virtualization platform, the data 0 of the fixed-length volume file (data 0 occupies 1MB of storage space) is also written into the virtualization platform, causing the virtualization platform to occupy too much space

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