生产环境 11T 数据在线备份方案的疑问

Background: Currently, the production environment is a cluster of three trackers and three storages built on virtual machines, all in the same group. The storage of a single node has reached 11 TB, using SAS disks, and the storage of a single node increases by 40 GB per day. The virtual machine storage pool of the client cannot bear the load, and it is necessary to migrate the files in FastDFS to Huawei object storage. Currently, it is planned to use a program to migrate the FastDFS files to Huawei object storage little by little. During the migration, the source files in the FastDFS cluster will be deleted. In order to ensure data security, a complete backup of the 11 TB data needs to be performed before the migration (during the backup, the use of the current production FastDFS cluster cannot be affected, that is, offline backup is not allowed, and only online backup is allowed).