From mboxrd@z Thu Jan 1 00:00:00 1970 From: Mark Nelson Subject: Re: OSD nodes with >=8 spinners, SSD-backed journals, and their performance impact Date: Tue, 15 Jan 2013 15:40:20 -0600 Message-ID: <50F5CCC4.7050408@inktank.com> References: <50F40C4B.6000301@inktank.com> <50F595FC.7020903@inktank.com> Mime-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit Return-path: Received: from mail-ie0-f171.google.com ([209.85.223.171]:62492 "EHLO mail-ie0-f171.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1755179Ab3AOVkW (ORCPT ); Tue, 15 Jan 2013 16:40:22 -0500 Received: by mail-ie0-f171.google.com with SMTP id 17so1176586iea.16 for ; Tue, 15 Jan 2013 13:40:21 -0800 (PST) In-Reply-To: Sender: ceph-devel-owner@vger.kernel.org List-ID: To: Gandalf Corvotempesta Cc: Florian Haas , ceph-devel@vger.kernel.org On 01/15/2013 03:24 PM, Gandalf Corvotempesta wrote: > 2013/1/15 Mark Nelson : >> I think the 12 bay supermicro 2U "A" chassis with 12 spinning disks, 10GbE, >> and two controllers is potentially a really nice balanced combination. > > Which chassis are your referring to ? I don't see any 2U with 12 front > and rear spinning disk from supermicro. Only 3U with rear disks > http://www.supermicro.com/products/chassis/2U/826/SC826BA-R920LP.cfm That chassis has 12 3.5" bays in front, with 2 2.5" bays in back. an interesting setup could be 12 spinning disks, with 2 very fast SSDs used for journals and OS. Would need to test it first, and not sure I like putting the OS on the journal drives. A more modest setup would be just to have the 12 spinning disks for data and journals and the rear drives for the OS. Mark