From mboxrd@z Thu Jan 1 00:00:00 1970 From: Andrew Thrift Subject: Large numbers of OSD per node Date: Mon, 05 Nov 2012 20:14:51 +1300 Message-ID: <5097676B.5020200@gmail.com> Mime-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit Return-path: Received: from cps.hostingdirect.co.nz ([210.79.48.6]:41192 "EHLO cps.hd.net.nz" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751060Ab2KEHfL (ORCPT ); Mon, 5 Nov 2012 02:35:11 -0500 Received: from 222.47.255.123.static.snap.net.nz ([123.255.47.222] helo=[192.168.69.11]) by cps.hd.net.nz with esmtpsa (TLSv1:AES256-SHA:256) (Exim 4.77) (envelope-from ) id 1TVGtb-0004GJ-D1 for ceph-devel@vger.kernel.org; Mon, 05 Nov 2012 20:14:57 +1300 Sender: ceph-devel-owner@vger.kernel.org List-ID: To: "ceph-devel@vger.kernel.org" Hi, We are evaluating CEPH for deployment. I was wondering if there are any current "best practices" around the number of OSD's per node ? e.g. We are looking at deploying 3 nodes, each with 72x SAS disks, and 2x 10gigabit Ethernet bonded. Would this best be configured as 72 OSD's per node. Or would we be better to using raid5 to have 18 OSD's per node ? Regards, Andrew