From mboxrd@z Thu Jan 1 00:00:00 1970 From: Stefan Priebe - Profihost AG Subject: Re: What would a good OSD node hardware configuration look like? Date: Tue, 06 Nov 2012 08:36:06 +0100 Message-ID: <5098BDE6.3050801@profihost.ag> References: <5097F3BD.2000904@conversis.de> <50985677.6090708@inktank.com> Mime-Version: 1.0 Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit Return-path: Received: from mail.profihost.ag ([85.158.179.208]:44903 "EHLO mail.profihost.ag" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752681Ab2KFHgJ (ORCPT ); Tue, 6 Nov 2012 02:36:09 -0500 In-Reply-To: <50985677.6090708@inktank.com> Sender: ceph-devel-owner@vger.kernel.org List-ID: To: Josh Durgin Cc: Dennis Jacobfeuerborn , ceph-devel@vger.kernel.org Am 06.11.2012 01:14, schrieb Josh Durgin: > On 11/05/2012 09:13 AM, Dennis Jacobfeuerborn wrote: >> Hi, >> I'm thinking about building a ceph cluster and I'm wondering what a good >> configuration would look like for 4-8 (and maybe more) 2HU 8-disk or 3HU >> 16-disk systems. >> Would it make sense to make each disk an individual OSD or should I >> perhaps >> create several raid-0 and create OSDs from those? > > This mainly depends on your ratio of disks to cpu/ram. Generally we > recommend 1GB ram and 1Ghz per OSD. If you've got enough cpu/ram, > running 1 OSD/disk is pretty common. It makes recovering from a > single disk failure faster. Just i node while using SSDs i've seen osd processes using up to two 3.6 Ghz cores. So under heavy load and disks and network with enough speed 1 ghz might be even too low. Right now i'm calculating with 1 3.6Ghz Core per OSD when using 10GBE and SSDs. Greets, Stefan