[PVE-User] Why are images and rootdir not supported on CephFS?

[Frank Thommen]

Dear all,

the PVE documentation on 
https://pve.proxmox.com/pve-docs/chapter-pvesm.html#_storage_types says, 
that "[File level based storage technologies] allow you to store content 
of any type".  However I found now - after having combined all available 
disks in a big CephFS setup - that this is not true for CephFS, which 
does not support images and rootdir.

What is the reason, that of all filesystens, CephFS doesn't support the 
main PVE content type? :-)

Ceph RPD on the other hand, doesn't support backup.

This seems to rule our Ceph (in whatever variant) as an unifying, shared 
storage for PVE.  Or do I miss an important point here?

Frank