From owner-freebsd-performance@FreeBSD.ORG Wed Jul 28 14:14:22 2010 Return-Path: Delivered-To: freebsd-performance@freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:4f8:fff6::34]) by hub.freebsd.org (Postfix) with ESMTP id 4EF091065752 for ; Wed, 28 Jul 2010 14:14:22 +0000 (UTC) (envelope-from avg@icyb.net.ua) Received: from citadel.icyb.net.ua (citadel.icyb.net.ua [212.40.38.140]) by mx1.freebsd.org (Postfix) with ESMTP id 7BA8B8FC15 for ; Wed, 28 Jul 2010 14:14:21 +0000 (UTC) Received: from odyssey.starpoint.kiev.ua (alpha-e.starpoint.kiev.ua [212.40.38.101]) by citadel.icyb.net.ua (8.8.8p3/ICyb-2.3exp) with ESMTP id RAA05012; Wed, 28 Jul 2010 17:01:05 +0300 (EEST) (envelope-from avg@icyb.net.ua) Message-ID: <4C503820.5080106@icyb.net.ua> Date: Wed, 28 Jul 2010 17:01:04 +0300 From: Andriy Gapon User-Agent: Thunderbird 2.0.0.24 (X11/20100517) MIME-Version: 1.0 To: Mike Tancsa References: <201007281327.o6SDRoZh022359@lava.sentex.ca> In-Reply-To: <201007281327.o6SDRoZh022359@lava.sentex.ca> X-Enigmail-Version: 0.95.7 Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: 7bit X-Mailman-Approved-At: Wed, 28 Jul 2010 15:38:36 +0000 Cc: freebsd-performance@freebsd.org Subject: Re: tuning zfs for large file reads X-BeenThere: freebsd-performance@freebsd.org X-Mailman-Version: 2.1.5 Precedence: list List-Id: Performance/tuning List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Wed, 28 Jul 2010 14:14:22 -0000 Can't really help you but here is couple of notes: 1. iostat -x output seems to be even more informative for disk I/O 2. Despite large amount of RAM (8GB) your ZFS ARC size stays at its minimum value near just 200MB. Not sure if this plays significant role in the performance issue, but perhaps something to look at. -- Andriy Gapon