From mboxrd@z Thu Jan 1 00:00:00 1970 From: Adam Nielsen Subject: Re: Newbie questions Date: Sun, 07 Oct 2012 01:05:59 +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]:60142 "EHLO plane.gmane.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751234Ab2JFPGT (ORCPT ); Sat, 6 Oct 2012 11:06:19 -0400 Received: from list by plane.gmane.org with local (Exim 4.69) (envelope-from ) id 1TKVxN-0000mz-Hm for ceph-devel@vger.kernel.org; Sat, 06 Oct 2012 17:06:21 +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 ; Sat, 06 Oct 2012 17:06:21 +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 ; Sat, 06 Oct 2012 17:06:21 +0200 In-Reply-To: Sender: ceph-devel-owner@vger.kernel.org List-ID: To: ceph-devel@vger.kernel.org Thanks both for your answers - very informative. I think I will set up a test Ceph system on my home servers to try it out. I have one more question: Ceph seems to handle failed nodes well enough, but what about failed network links? Say you have a few systems in two locations, connected by a single link. If the link fails, you will have two isolated networks, each of which will think the other has failed and presumably will try to go on as best it can. What happens when the link comes back up again? What if the same file was modified by both isolated clusters when the link was down? What version will end up back in the cluster? Thanks again, Adam.