Cephfs的快照功能

前言

Cephfs的快照功能在官网都很少提及，因为即使开发了很多年，但是由于cephfs的复杂性，功能一直没能达到稳定，这里，只是介绍一下这个功能，怎么使用，并且建议不要在生产中使用，因为搞不好是会丢数据的

功能介绍

首先这个功能是默认关闭的，所以需要开启

[root@lab8106 ~]# ceph fs set ceph  allow_new_snaps 1
Error EPERM: Warning! This feature is experimental.It may cause problems up to and including data loss.Consult the documentation at ceph.com, and if unsure, do not proceed.Add --yes-i-really-mean-it if you are certain.
[root@lab8106 ~]# ceph fs set ceph  allow_new_snaps 1  --yes-i-really-mean-it

从提示上可以看到，还是不要在生产上使用

开发者的话：

In Jewel ceph fs snapshots are still experimental. Does someone has a clue when this would become stable, or how experimental this is ?


We're not sure yet. Probably it will follow stable multi-MDS; we're thinking about redoing some of the core snapshot pieces still.