From mboxrd@z Thu Jan 1 00:00:00 1970 From: Simon Leinen Subject: Re: OSD nodes with >=8 spinners, SSD-backed journals, and their performance impact Date: Fri, 18 Jan 2013 19:54:53 +0100 Message-ID: References: <50F40C4B.6000301@inktank.com> <50F595FC.7020903@inktank.com> <50F5CCC4.7050408@inktank.com> Mime-Version: 1.0 Content-Type: text/plain Return-path: Received: from plane.gmane.org ([80.91.229.3]:40857 "EHLO plane.gmane.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1755779Ab3ARTzF (ORCPT ); Fri, 18 Jan 2013 14:55:05 -0500 Received: from list by plane.gmane.org with local (Exim 4.69) (envelope-from ) id 1TwI1s-0000iZ-NM for ceph-devel@vger.kernel.org; Fri, 18 Jan 2013 20:55:08 +0100 Received: from user-23-13.vpn.switch.ch ([130.59.23.13]) by main.gmane.org with esmtp (Gmexim 0.1 (Debian)) id 1AlnuQ-0007hv-00 for ; Fri, 18 Jan 2013 20:55:08 +0100 Received: from simon.leinen by user-23-13.vpn.switch.ch with local (Gmexim 0.1 (Debian)) id 1AlnuQ-0007hv-00 for ; Fri, 18 Jan 2013 20:55:08 +0100 Sender: ceph-devel-owner@vger.kernel.org List-ID: To: ceph-devel@vger.kernel.org Mark Nelson writes: > 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. FWIW, we have a few Quanta S210-X22RQ[1], which are very similar - 2U, 12 3.5" bays in front, 2*2.5 in back. We'll try a similar configuration to what you propose, though with only 8 spinning disks (3TB WD RED) and one SSD (256GB Samsung 840 pro). 2*10GE, 2*Xeon E5-2630, 128GB RAM. > 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. -- Simon. [1] http://www.quantaqct.com/en/01_product/02_detail.php?mid=27&sid=145&id=147&qs=82