From owner-freebsd-stable@FreeBSD.ORG Sat Jan 8 09:55:07 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 1AF7910656CE for ; Sat, 8 Jan 2011 09:55:07 +0000 (UTC) (envelope-from jdc@koitsu.dyndns.org) Received: from qmta11.emeryville.ca.mail.comcast.net (qmta11.emeryville.ca.mail.comcast.net [76.96.27.211]) by mx1.freebsd.org (Postfix) with ESMTP id D06948FC18 for ; Sat, 8 Jan 2011 09:55:06 +0000 (UTC) Received: from omta15.emeryville.ca.mail.comcast.net ([76.96.30.71]) by qmta11.emeryville.ca.mail.comcast.net with comcast id sxqL1f0061Y3wxoABxv6Gi; Sat, 08 Jan 2011 09:55:06 +0000 Received: from koitsu.dyndns.org ([98.248.34.134]) by omta15.emeryville.ca.mail.comcast.net with comcast id sxq51f0032tehsa8bxq5dD; Sat, 08 Jan 2011 09:50:06 +0000 Received: by icarus.home.lan (Postfix, from userid 1000) id 38C859B427; Sat, 8 Jan 2011 01:50:05 -0800 (PST) Date: Sat, 8 Jan 2011 01:50:05 -0800 From: Jeremy Chadwick To: Josef Karthauser Message-ID: <20110108095005.GA4044@icarus.home.lan> References: <488AE93A-97B9-4F01-AD0A-0098E4B329C3@my.gd> <4D25BF91.7070304@my.gd> <4D25C760.4070703@digsys.bg> <20110107111635.GL28453@over-yonder.net> <2E0FDC35-B6E3-49C7-A55B-B1B08FFBF1DB@tao.org.uk> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <2E0FDC35-B6E3-49C7-A55B-B1B08FFBF1DB@tao.org.uk> User-Agent: Mutt/1.5.21 (2010-09-15) Cc: "freebsd-stable@freebsd.org" , Artem Belevich , "Matthew D. Fuller" , Daniel Kalchev 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: Sat, 08 Jan 2011 09:55:07 -0000 On Sat, Jan 08, 2011 at 09:14:19AM +0000, Josef Karthauser wrote: > On 7 Jan 2011, at 17:30, Artem Belevich wrote: > > One way to get specific ratio for *your* pool would be to collect > > record size statistics from your pool using "zdb -L -b " and > > then calculate L2ARC:ARC ratio based on average record size. I'm not > > sure, though whether L2ARC stores records in compressed or > > uncompressed form. > > Can someone point me to a reference describing the various zfs caches available? What's the arc and zil? Ive been running some zfs for a few years now, and must have missed thus entire subject :/. ARC: http://en.wikipedia.org/wiki/ZFS#Cache_management L2ARC: http://en.wikipedia.org/wiki/ZFS#Storage_pools L2ARC: http://blogs.sun.com/brendan/entry/test Both: http://www.c0t0d0s0.org/archives/5329-Some-insight-into-the-read-cache-of-ZFS-or-The-ARC.html Both: http://nilesh-joshi.blogspot.com/2010/07/zfs-revisited.html ZIL: http://blogs.sun.com/perrin/entry/the_lumberjack ZIL: http://blogs.sun.com/realneel/entry/the_zfs_intent_log Enjoy. -- | Jeremy Chadwick jdc@parodius.com | | Parodius Networking http://www.parodius.com/ | | UNIX Systems Administrator Mountain View, CA, USA | | Making life hard for others since 1977. PGP 4BD6C0CB |