From owner-freebsd-stable@FreeBSD.ORG Sun Jan 9 08:47:44 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 DD302106566B for ; Sun, 9 Jan 2011 08:47:44 +0000 (UTC) (envelope-from joe@tao.org.uk) Received: from alpha.tao.org.uk (alpha.tao.org.uk [212.42.1.232]) by mx1.freebsd.org (Postfix) with ESMTP id 9E48B8FC0C for ; Sun, 9 Jan 2011 08:47:44 +0000 (UTC) Received: from [90.155.77.83] (p4.dhcp.tao.org.uk [90.155.77.83]) (Authenticated sender: joemail@alpha.tao.org.uk) by alpha.tao.org.uk (Postfix) with ESMTPA id 0C6131076DE6; Sun, 9 Jan 2011 08:47:43 +0000 (GMT) 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> <20110108095005.GA4044@icarus.home.lan> In-Reply-To: <20110108095005.GA4044@icarus.home.lan> Mime-Version: 1.0 (iPad Mail 8C148) Content-Type: text/plain; charset=us-ascii Message-Id: <96D05C71-2B1F-4813-B8FD-1DA39E384FC6@tao.org.uk> Content-Transfer-Encoding: quoted-printable X-Mailer: iPad Mail (8C148) From: Josef Karthauser Date: Sun, 9 Jan 2011 08:48:20 +0000 To: Jeremy Chadwick 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: Sun, 09 Jan 2011 08:47:44 -0000 Brill! Thanks :) Joe On 8 Jan 2011, at 09:50, Jeremy Chadwick wrote: > 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. >>=20 >> Can someone point me to a reference describing the various zfs caches ava= ilable? What's the arc and zil? Ive been running some zfs for a few years no= w, and must have missed thus entire subject :/. >=20 > 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-ca= che-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 >=20 > Enjoy. >=20 > --=20 > | 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 | >=20 >=20