Ceph, MDS, CephFS questions

Vassilis Kipouros

Active Member
Nov 2, 2016
Good evening,

Been trying to deploy MDS & CephFS by compiling a couple of very scarce threads from here & there.

But no luck till now. Ceph-deploy tool does not work as expected and couldn't
start the MDS after manually adding the [mds] section etc in ceph.conf

Is MDS and CephFS management in Proxmox a feature we should be expecting soon?

Has anyone successfully deployed CephFS on Proxmox that can give me/us some advice?

* I have a small 3 node cluster with 5x1T OSD's each and my ultimate plan is to deploy CephFS on an erasure coded pool that will act like raid5 between the three nodes, being able to sustain a whole node failure.

** Currently I have replicated pool of two copies, which gives me about 7T of storage, but the data I need to fit in that pool is 9T that's why I need the erasure code

*** Another question: Say all your nodes get fried but you magically manage to save your OSD's.
Is there a way to add/import those OSD's on another fresh/new (or not) cluster and maintain your data?

Kind regards...


New Member
Apr 9, 2017
I also am interested in MDS on CephFS, to provide NFS file shares from an even smaller cluster. Not having ceph-deploy seems intentional as it does not integrate as well with the pve cluster. Eventually I will also try building a MDS manually per Ceph's documentation.

Still new to Ceph, but I don't think the recovery procedures are optimized for reimporting OSDs. Very large clusters will lose nodes all the time, and just have to add new ones faster than they fail. Perhaps backup RBD or other objects, and save the existing OSD import as a last-chance effort.


Proxmox Staff Member
Staff member
Jan 7, 2016
  • Like
Reactions: Vassilis Kipouros


Mar 19, 2018
+1 for ceph MDS support, I managed to get it up and running once but am back to errors! :(


The Proxmox community has been around for many years and offers help and support for Proxmox VE, Proxmox Backup Server, and Proxmox Mail Gateway.
We think our community is one of the best thanks to people like you!

Get your subscription!

The Proxmox team works very hard to make sure you are running the best software and getting stable updates and security enhancements, as well as quick enterprise support. Tens of thousands of happy customers have a Proxmox subscription. Get your own in 60 seconds.

Buy now!