面向OpenStack/Ceph的虚拟机备份系统研究

针对OpenStack面临的虚拟机容灾备份问题，提出了一种基于Ceph存储快照的虚拟机容灾备份系统，备份时对虚拟机存储在Ceph中的磁盘生成快照，再根据备份要求计算有效数据或者变化数据，保存虚拟机的配置信息以及磁盘数据，恢复时自动创建相同配置的虚拟机并将当前快照点的磁盘数据恢复到该虚拟机中.实验表明，该方法比OpenStack的快照备份方法能有效节省备份时间和存储空间，并且可以实现后者不具有的增量备份、多磁盘备份等功能.

Virtual Machine Backup System for OpenStack/Ceph

Aimed at virtual machine disaster backup and recovery problem faced by OpenStack, the authors design and carry out a virtual machine backup system based on Ceph storage snapshot. During backup process, generate a snapshot of the virtual machine disk stored in Ceph, and according to the backup requirement, calculate disk valid data or modified data, save the config information of the virtual machine and disk data. During recovery process, automatically create the same configured virtual machine, and restore the data of current snapshot point to the corresponding disk. The experimental results show that proposed system can effectively save backup time and storage space compared with OpenStack''s snapshot backup method, and implement the functions of incremental backup and multi-disk backup that the latter does not have.