From mboxrd@z Thu Jan 1 00:00:00 1970 From: Stefan Priebe - Profihost AG Subject: Designing a cluster guide Date: Thu, 10 May 2012 15:23:40 +0200 Message-ID: <4FABC15C.3030500@profihost.ag> References: <4FABAFE9.5060202@profihost.ag> Mime-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-15 Content-Transfer-Encoding: 7bit Return-path: Received: from mail.profihost.ag ([85.158.179.208]:40525 "EHLO mail.profihost.ag" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1754485Ab2EJNXl (ORCPT ); Thu, 10 May 2012 09:23:41 -0400 In-Reply-To: <4FABAFE9.5060202@profihost.ag> Sender: ceph-devel-owner@vger.kernel.org List-ID: To: ceph-devel@vger.kernel.org Hi, the "Designing a cluster guide" http://wiki.ceph.com/wiki/Designing_a_cluster is pretty good but it still leaves some questions unanswered. It mentions for example "Fast CPU" for the mds system. What does fast mean? Just the speed of one core? Or is ceph designed to use multi core? Is multi core or more speed important? The Cluster Design Recommendations mentions to seperate all Daemons on dedicated machines. Is this also for the MON useful? As they're so leightweight why not running them on the OSDs? Regarding the OSDs is it fine to use an SSD Raid 1 for the journal and perhaps 22x SATA Disks in a Raid 10 for the FS or is this quite absurd and you should go for 22x SSD Disks in a Raid 6? Is it more useful the use a Raid 6 HW Controller or the btrfs raid? Use single socket Xeon for the OSDs or Dual Socket? Thanks and greets Stefan