Re: Unable to mount cephfs - can't read superblock

[Adam Nielsen <a.nielsen@shikadi.net>]

> Ah, I see you only have one OSD, where the default replication level is 2.
> Also, pools don't work by default if only one replica is left.
>
> You better add a second OSD or just do a mkcephfs again with a second OSD in
> the configuration.

Ah ok.  From my earlier post I think I can add the second OSD on the same disk 
since it is mounted on /var/lib/ceph/.  Are there likely to be any problems 
with this, going into production?  (I mean having two OSDs on the same node.) 
  I will eventually have a second node, but I know only having two isn't ideal.

> Just a reminder, it's also in the docs, but CephFS is still in beta, so expect
> weird things to happen. It can however not hurt to play with it!

Thanks for the reminder - but I only plan to use CephFS to store backup copies 
of things until it becomes stable, so hopefully I can give it some testing and 
survive if it breaks :-)

> P.S.: There's also a new and shiny ceph-users list since two days ago, might
> want to subscribe there.

I will use that list as soon as it appears on GMane, since I find their NNTP 
interface a lot easier than managing a bunch of mailing list subscriptions! 
Maybe someone with more authority than myself can add it?

   http://gmane.org/subscribe.php

Cheers,
Adam.