From mboxrd@z Thu Jan 1 00:00:00 1970 From: Adam Nielsen Subject: Re: Unable to mount cephfs - can't read superblock Date: Sat, 09 Feb 2013 21:25:46 +1000 Message-ID: References: <51162831.1070506@42on.com> <51162E6F.5010405@42on.com> Mime-Version: 1.0 Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit Return-path: Received: from plane.gmane.org ([80.91.229.3]:35367 "EHLO plane.gmane.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752878Ab3BIL0G (ORCPT ); Sat, 9 Feb 2013 06:26:06 -0500 Received: from list by plane.gmane.org with local (Exim 4.69) (envelope-from ) id 1U48ZW-0006Ql-LM for ceph-devel@vger.kernel.org; Sat, 09 Feb 2013 12:26:18 +0100 Received: from 124-170-93-254.dyn.iinet.net.au ([124.170.93.254]) by main.gmane.org with esmtp (Gmexim 0.1 (Debian)) id 1AlnuQ-0007hv-00 for ; Sat, 09 Feb 2013 12:26:18 +0100 Received: from a.nielsen by 124-170-93-254.dyn.iinet.net.au with local (Gmexim 0.1 (Debian)) id 1AlnuQ-0007hv-00 for ; Sat, 09 Feb 2013 12:26:18 +0100 In-Reply-To: <51162E6F.5010405@42on.com> Sender: ceph-devel-owner@vger.kernel.org List-ID: To: ceph-devel@vger.kernel.org > 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.