X-Spam-Checker-Version: SpamAssassin 3.4.0-r929098 (2010-03-30) on oss.sgi.com X-Spam-Level: X-Spam-Status: No, score=-1.9 required=5.0 tests=BAYES_00 autolearn=ham version=3.4.0-r929098 Received: from cuda.sgi.com (cuda2.sgi.com [192.48.176.25]) by oss.sgi.com (8.14.3/8.14.3/SuSE Linux 0.8) with ESMTP id p0DMXP4K190634 for ; Thu, 13 Jan 2011 16:33:25 -0600 X-ASG-Debug-ID: 1294958133-6b6a02090000-NocioJ X-Barracuda-URL: http://cuda.sgi.com:80/cgi-bin/mark.cgi Received: from smtp3-g21.free.fr (localhost [127.0.0.1]) by cuda.sgi.com (Spam Firewall) with ESMTP id D2F2626344E for ; Thu, 13 Jan 2011 14:35:37 -0800 (PST) Received: from smtp3-g21.free.fr (smtp3-g21.free.fr [212.27.42.3]) by cuda.sgi.com with ESMTP id BZDOeeLqXwt5Sdfr for ; Thu, 13 Jan 2011 14:35:37 -0800 (PST) Received: from galadriel.home (unknown [82.235.234.79]) by smtp3-g21.free.fr (Postfix) with ESMTP id E3604A6201; Thu, 13 Jan 2011 23:35:29 +0100 (CET) Date: Thu, 13 Jan 2011 23:35:27 +0100 From: Emmanuel Florac To: Cory Coager Cc: xfs@oss.sgi.com X-ASG-Orig-Subj: Re: extremely slow write performance plaintext Subject: Re: extremely slow write performance plaintext Message-ID: <20110113233527.6dca104d@galadriel.home> In-Reply-To: <3205_1294953756_4D2F6D1C_3205_1943_1_4D2F6D1C.2060409@davisvision.com> References: <3205_1294953756_4D2F6D1C_3205_1943_1_4D2F6D1C.2060409@davisvision.com> Organization: Intellique X-Mailer: Claws Mail 3.7.3 (GTK+ 2.20.1; i686-pc-linux-gnu) Mime-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: quoted-printable X-Barracuda-Connect: smtp3-g21.free.fr[212.27.42.3] X-Barracuda-Start-Time: 1294958139 X-Barracuda-Bayes: INNOCENT GLOBAL 0.0000 1.0000 -2.0210 X-Barracuda-Virus-Scanned: by cuda.sgi.com at sgi.com X-Barracuda-Spam-Score: -2.02 X-Barracuda-Spam-Status: No, SCORE=-2.02 using per-user scores of TAG_LEVEL=2.0 QUARANTINE_LEVEL=1000.0 KILL_LEVEL=2.1 tests= X-Barracuda-Spam-Report: Code version 3.2, rules version 3.2.2.52295 Rule breakdown below pts rule name description ---- ---------------------- -------------------------------------------------- X-Virus-Scanned: ClamAV version 0.94.2, clamav-milter version 0.94.2 on oss.sgi.com X-Virus-Status: Clean Le Thu, 13 Jan 2011 16:22:36 -0500 vous =E9criviez: > I am getting over=20 > 180MB/s read speeds and 40MB/s write speeds on all the LV's except > one.=20 This is pretty bad. My last 14 SAS drives RAID-6 array achieved 500 MB/s write, 1GB/s read sustained. What is the SAS controller? the RAID controller? Please provide more details about the=20 enclosure/drives/cabling too. What is the kernel/distro? Did you striped your LVs across multiple physical volumes except the last one? What's the output for pvdisplay, vgdisplay, lvdisplay? --=20 ------------------------------------------------------------------------ Emmanuel Florac | Direction technique | Intellique | | +33 1 78 94 84 02 ------------------------------------------------------------------------