Re: CephFS Snapshots in Mimic

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Hi Kenneth,

On Tue, 31 Jul 2018 16:44:36 +0200, Kenneth Waegeman wrote:

> Hi all,
> 
> I updated an existing Luminous cluster to Mimic 13.2.1. All daemons were 
> updated, so I did ceph osd require-osd-release mimic, so everything 
> seems up to date.
> 
> I want to try the snapshots in Mimic, since this should be stable, so i ran:
> 
> [root@osd2801 alleee]# ceph fs set cephfs allow_new_snaps true
> enabled new snapshots
> 
> Now, when I try to create a snapshot, it is not working:
> 
> [root@osd2801 ~]# mkdir /mnt/bla/alleee/aaas
> [root@osd2801 ~]# mkdir /mnt/bla/alleee/aaas/.snap
> mkdir: cannot create directory ‘/mnt/bla/alleee/aaas/.snap’: File exists
> 
> I tried this using ceph-fuse and the kernel client, but always get the 
> same response.
> 
> Should I enable something else to get snapshots working ?

It looks as though you're just missing the snapshot name in the mkdir
request:
rapido1:/# cd /mnt/cephfs
rapido1:/mnt/cephfs# echo "before snap" >> data
rapido1:/mnt/cephfs# mkdir -p .snap/mysnapshot
rapido1:/mnt/cephfs# echo "after snap" >> data
rapido1:/mnt/cephfs# cat .snap/mysnapshot/data
before snap
rapido1:/mnt/cephfs# cat data
before snap
after snap

Cheers, David
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