K8s uses CEpH for persistent Storage

I. Overview

Cephfs is a CEpH cluster-based file system that is compatible with POSIX standards.
When creating a cephfs file system, you must add the MDS service to the CEpH cluster. This service processes the metadata part in the POSIX file system, and the actual data part is processed by the osds in the CEpH cluster.
Cephfs supports loading by using INCORE modules and fuse. Both the kernel mode and fuse mode call the libcephfs library to load the cephfs file system. The libcephfs library calls the librados library to communicate with the CEpH cluster to load the cephfs.

K8s uses CEpH for persistent Storage