From owner-freebsd-stable@FreeBSD.ORG Fri Jan 7 11:16:38 2011 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 2B73C106564A for ; Fri, 7 Jan 2011 11:16:38 +0000 (UTC) (envelope-from fullermd@over-yonder.net) Received: from thyme.infocus-llc.com (server.infocus-llc.com [206.156.254.44]) by mx1.freebsd.org (Postfix) with ESMTP id F0B778FC12 for ; Fri, 7 Jan 2011 11:16:37 +0000 (UTC) Received: from draco.over-yonder.net (c-75-64-226-141.hsd1.ms.comcast.net [75.64.226.141]) (using TLSv1 with cipher ADH-CAMELLIA256-SHA (256/256 bits)) (No client certificate requested) by thyme.infocus-llc.com (Postfix) with ESMTPSA id BFDCA37B507; Fri, 7 Jan 2011 05:16:36 -0600 (CST) Received: by draco.over-yonder.net (Postfix, from userid 100) id F261B61C5A; Fri, 7 Jan 2011 05:16:35 -0600 (CST) Date: Fri, 7 Jan 2011 05:16:35 -0600 From: "Matthew D. Fuller" To: Daniel Kalchev Message-ID: <20110107111635.GL28453@over-yonder.net> References: <4D21E679.80002@my.gd> <84882169-0461-480F-8B4C-58E794BCC8E6@my.gd> <488AE93A-97B9-4F01-AD0A-0098E4B329C3@my.gd> <4D25BF91.7070304@my.gd> <4D25C760.4070703@digsys.bg> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <4D25C760.4070703@digsys.bg> X-Editor: vi X-OS: FreeBSD User-Agent: Mutt/1.5.21-fullermd.4 (2010-09-15) X-Virus-Scanned: clamav-milter 0.96.5 at thyme.infocus-llc.com X-Virus-Status: Clean Cc: freebsd-stable@freebsd.org Subject: Re: ZFS - moving from a zraid1 to zraid2 pool with 1.5tb disks 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: Fri, 07 Jan 2011 11:16:38 -0000 On Thu, Jan 06, 2011 at 03:45:04PM +0200 I heard the voice of Daniel Kalchev, and lo! it spake thus: > > You should also know that having large L2ARC requires that you also > have larger ARC, because there are data pointers in the ARC that > point to the L2ARC data. Someone will do good to the community to > publish some reasonable estimates of the memory needs, so that > people do not end up with large but unusable L2ARC setups. Estimates I've read in the past are that L2ARC consumes ARC space at around 1-2%. -- Matthew Fuller (MF4839) | fullermd@over-yonder.net Systems/Network Administrator | http://www.over-yonder.net/~fullermd/ On the Internet, nobody can hear you scream.