From owner-freebsd-hardware@FreeBSD.ORG Wed Jul 16 17:43:55 2008 Return-Path: Delivered-To: freebsd-hardware@freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:4f8:fff6::34]) by hub.freebsd.org (Postfix) with ESMTP id D442B1065676 for ; Wed, 16 Jul 2008 17:43:55 +0000 (UTC) (envelope-from freebsd@optiksecurite.com) Received: from relais.videotron.ca (relais.videotron.ca [24.201.245.36]) by mx1.freebsd.org (Postfix) with ESMTP id A747B8FC13 for ; Wed, 16 Jul 2008 17:43:55 +0000 (UTC) (envelope-from freebsd@optiksecurite.com) MIME-version: 1.0 Content-transfer-encoding: 8BIT Content-type: text/plain; charset=ISO-8859-1; format=flowed Received: from [192.168.10.102] ([74.56.107.65]) by VL-MO-MR005.ip.videotron.ca (Sun Java(tm) System Messaging Server 6.3-4.01 (built Aug 3 2007; 32bit)) with ESMTP id <0K4300H2EYGHKCG1@VL-MO-MR005.ip.videotron.ca> for freebsd-hardware@freebsd.org; Wed, 16 Jul 2008 12:43:29 -0400 (EDT) Message-id: <487E2585.7080409@optiksecurite.com> Date: Wed, 16 Jul 2008 12:44:53 -0400 From: FreeBSD User-Agent: Thunderbird 2.0.0.14 (Windows/20080421) To: Maciej Suszko References: <20080716174233.1232a5f3@suszko.eu> In-reply-to: <20080716174233.1232a5f3@suszko.eu> Cc: freebsd-hardware@freebsd.org Subject: Re: Dell PE2950 - SAS 6/iR X-BeenThere: freebsd-hardware@freebsd.org X-Mailman-Version: 2.1.5 Precedence: list List-Id: General discussion of FreeBSD hardware List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Wed, 16 Jul 2008 17:43:55 -0000 Maciej Suszko a écrit : > I think about buying Dell PE2950 with SAS 6/iR integrated RAID > controller. It would be double Intel Quad Core Xeon E5420 with 3.5" SAS > 15k RPM disks connected to SAS 6/iR RAID controller. > > I'm curious if anyone is running FreeBSD-7.0-RELEASE on such machine > and if there any problems with this controller - is SAS 6/iR supported > by mpt or mfi? Anyone happily using it? > I never tried SAS 6 but I have SAS 5 in a few Dell servers and it's performance is horrible. I tried some tips I read to optimize the performance but none worked (I must admit that I didn't tried that hard but still...). Just to compare, I have the exact same disk (the same 3,5" SAS 15K that you plan to buy) in a PowerEdge 860 with SAS 5 and in a PowerEdge 1950 with PERC5 (both in RAID 1) and the performance are like day and night (tested with dbench): SAS 5: Throughput 98.9811 MB/sec 4 procs PERC5: Throughput 321.704 MB/sec 4 procs The last server I bought is a PowerEdge 840 with PERC5 but this time with 7200RPM SATA drives (3 in RAID 5) and the performance is still impressive : Throughput 266.81 MB/sec 4 procs I highly recommand upgrading to the PERC controller. SAS5 is recognized by the mpt driver and PERC5 by mfi. YMMV, Martin