On 2019-09-04 1:36 p.m., Chris Murphy wrote:

>>
> 
> I don't really know how snapper works.
> 
> The way 'btrfs subvolume snapshot' works,  you must point it to a
> subvolume. It won't snapshot a regular directory and from what you
> posted above, there are no subvolumes in /var or /var/lib which means
> trying to snapshot /var/lib/ceph/osd/ceph-....  would fail. So maybe
> it's failing but snapper doesn't show the error. I'm not really sure.
> 

In this case, his snapshots are all of the root.

I don't know how Ceph works, but since we already confirmed that there
are no subvolumes under /var, the only other explanation is that
/var/lib/ceph/osd/ceph-<n> is a submount

What is the the result of running:
mount | grep /var