From mboxrd@z Thu Jan 1 00:00:00 1970 From: Adam Nielsen Subject: Re: Newbie questions Date: Sun, 07 Oct 2012 10:08:17 +1000 Message-ID: References: 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]:60632 "EHLO plane.gmane.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1750936Ab2JGAIa (ORCPT ); Sat, 6 Oct 2012 20:08:30 -0400 Received: from list by plane.gmane.org with local (Exim 4.69) (envelope-from ) id 1TKeQ6-0002vw-4A for ceph-devel@vger.kernel.org; Sun, 07 Oct 2012 02:08:34 +0200 Received: from 124-170-67-40.dyn.iinet.net.au ([124.170.67.40]) by main.gmane.org with esmtp (Gmexim 0.1 (Debian)) id 1AlnuQ-0007hv-00 for ; Sun, 07 Oct 2012 02:08:34 +0200 Received: from a.nielsen by 124-170-67-40.dyn.iinet.net.au with local (Gmexim 0.1 (Debian)) id 1AlnuQ-0007hv-00 for ; Sun, 07 Oct 2012 02:08:34 +0200 In-Reply-To: Sender: ceph-devel-owner@vger.kernel.org List-ID: To: ceph-devel@vger.kernel.org > The problem you are describing is called split-brain. Ceph has an odd > number of monitors and quorum is required before objects can be served. > The partition with the smaller number of monitors will wait harmlessly > until connectivity is reestablished . Ah right, that makes sense. Is this set in stone or can it be configured? I'm just thinking that in this scenario it could be beneficial to allow read-only access from the partition with the smaller number of monitors, if there are also clients that can only see those hosts. (For example, a business with two sites, and the link between them goes down, so client PCs can only see their site-local servers.) Thanks, Adam.