From owner-freebsd-stable@FreeBSD.ORG Sun Feb 3 22:38:30 2008 Return-Path: Delivered-To: freebsd-stable@freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:4f8:fff6::34]) by hub.freebsd.org (Postfix) with ESMTP id AB21016A41B for ; Sun, 3 Feb 2008 22:38:30 +0000 (UTC) (envelope-from chrcoluk@gmail.com) Received: from ug-out-1314.google.com (ug-out-1314.google.com [66.249.92.174]) by mx1.freebsd.org (Postfix) with ESMTP id 3883A13C469 for ; Sun, 3 Feb 2008 22:38:30 +0000 (UTC) (envelope-from chrcoluk@gmail.com) Received: by ug-out-1314.google.com with SMTP id y2so1440954uge.37 for ; Sun, 03 Feb 2008 14:38:29 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=gamma; h=domainkey-signature:received:received:message-id:date:from:to:subject:cc:in-reply-to:mime-version:content-type:content-transfer-encoding:content-disposition:references; bh=aIcCt/KgMQelirhwEbkceAeN1/LO5Y3rbxDG3sgwPI4=; b=Fg8JiF7nK20g9GJpNP1m9ouY/8Ft6mTgc5PQDyEZZ9/r+AVSXHr0giGqRAuDbVU3nY9b3wt+SPgKys2e5cM24QOhrDMx5SUHsHqfGNQxWSLPEgn7EcBeJSajnDfZ+MX7gqfG9Nmd6vdo85P8dTGi6HZkHCJi/nTm661mkuQWN70= DomainKey-Signature: a=rsa-sha1; c=nofws; d=gmail.com; s=gamma; h=message-id:date:from:to:subject:cc:in-reply-to:mime-version:content-type:content-transfer-encoding:content-disposition:references; b=pbTlx1qQv0TjkyUqHgZW+1QEWjkHjC+8IxR+A4RB/x1PNQUv60iGrIdEjs6BkSLbwVUBQCyrY1Qxb13ljHvHxBCocFsGCjo8PuXKW9LKFu7/WbS1GFc4f6iosZ4Rk3qYc0AhIEcvnBHUjCgAcd/c3fzi1H7MSFN3OZDBKV+EeJ4= Received: by 10.67.15.15 with SMTP id s15mr1387657ugi.27.1202078308507; Sun, 03 Feb 2008 14:38:28 -0800 (PST) Received: by 10.66.219.18 with HTTP; Sun, 3 Feb 2008 14:38:28 -0800 (PST) Message-ID: <3aaaa3a0802031438u112fe5damc48adc286f308252@mail.gmail.com> Date: Sun, 3 Feb 2008 22:38:28 +0000 From: Chris To: "Michael Butler" In-Reply-To: <47A63610.4070608@protected-networks.net> MIME-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: 7bit Content-Disposition: inline References: <3aaaa3a0802030751w69ce59a9oeb869e3d87d92616@mail.gmail.com> <47A62B00.1060403@egr.msu.edu> <3aaaa3a0802031318y2e3fd33en8071c82172ab9ecf@mail.gmail.com> <47A63610.4070608@protected-networks.net> Cc: Adam McDougall , freebsd-stable@freebsd.org, Ivan Voras Subject: Re: gjournal panic 7.0-RC1 X-BeenThere: freebsd-stable@freebsd.org X-Mailman-Version: 2.1.5 Precedence: list List-Id: Production branch of FreeBSD source code List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Sun, 03 Feb 2008 22:38:30 -0000 > If I understood this thread correctly, the impression of poor > performance is based on a configuration where both the journal and the > data are on the same physical drive. Intuitively, this will likely > penalize any transaction on the volume, read or write, since you're > asking the drive to not only accumulate a queue of information to the > journal in one region of the disk but also to flush that data in "idle > time" to a region in the data space on that same disk at a significant > seek-length away. > > I would think that journaling on one drive and storing the resultant > data-set on another would improve performance enormously (reduced > seek-lengths) and more so if they were 1) high-rpm drives (less > rotational latency) and 2) on different buses (no bus/controller > contention), > > Michael > Yes I have suspected this, there is 2 physical drives in the machine so this would be possible, if its possible to swap the journals round so they journaling for each other I will give it a go tommorow. They both sata 300 drives. Chris