From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from relay.sgi.com (relay3.corp.sgi.com [198.149.34.15]) by oss.sgi.com (Postfix) with ESMTP id 9F49F8008 for ; Tue, 6 May 2014 08:51:54 -0500 (CDT) Received: from cuda.sgi.com (cuda1.sgi.com [192.48.157.11]) by relay3.corp.sgi.com (Postfix) with ESMTP id 5317CAC006 for ; Tue, 6 May 2014 06:51:51 -0700 (PDT) Received: from mail1.g1.pair.com (mail1.g1.pair.com [66.39.3.162]) by cuda.sgi.com with ESMTP id yhH4LUgEqNIQgqke for ; Tue, 06 May 2014 06:51:49 -0700 (PDT) Date: Tue, 6 May 2014 15:51:49 +0200 From: Emmanuel Florac Subject: Re: XFS tune to adaptec ASR71605 Message-ID: <20140506155149.5cf056b5@harpe.intellique.com> In-Reply-To: References: <20140506130008.13a1a7ee@harpe.intellique.com> Mime-Version: 1.0 List-Id: XFS Filesystem from SGI List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable Errors-To: xfs-bounces@oss.sgi.com Sender: xfs-bounces@oss.sgi.com To: Steve Brooks Cc: xfs@oss.sgi.com Le Tue, 6 May 2014 14:14:35 +0100 (BST) Steve Brooks =E9crivait: > Thanks for the reply Emmanuel, I installed and rua bonnie++ although > I will need to research the results Yup, they're... weird :) Write speed is abysmal, but random seeks very high. Please try my settings so that we can compare the numbers more directly: bonnie++ -f -d ./ -n 50 If you translate the output from my test file with bon_csv2 Did you turn off write cache? did you tune the IO scheduler, read ahead, and queue length? Here are the settings I'm generally using with this type of controllers (for better sequential IO): echo none > /sys/block/sda/queue/scheduler echo 1024 > /sys/block/sda/queue/nr_requests echo 65536 > /sys/block/sda/queue/read_ahead_kb You can check the cache status in the output from = arcconf getconfig 1 = If you didn't install arcconf, you definitely should :) If you turned off the write cache, be aware that this is not the expected mode of operation for modern RAID controllers... Go buy a ZMM if necessary. -- = ------------------------------------------------------------------------ Emmanuel Florac | Direction technique | Intellique | | +33 1 78 94 84 02 ------------------------------------------------------------------------ _______________________________________________ xfs mailing list xfs@oss.sgi.com http://oss.sgi.com/mailman/listinfo/xfs