What scenarios are cephfs volume and subvolume mainly used for, and what is the difference between it and cephfs?
My current understanding is that cephfs volumes and subvolumes can provide a way of sharing between docker and OpenStack Manila. Moreover, I saw that the official website mentioned that it is recommended to use volume to create multiple file systems. But I feel that these cephfs can do the same, so I don't quite understand what is the essential difference between cephfs and cephfs volume?
Below are some of the information I have checked, any reply is very grateful~
https://www.reddit.com/r/ceph/comments/j5k3by/reasons_for_using_cephfs_subvolumes_and_volume/