From owner-freebsd-stable@FreeBSD.ORG Thu May 29 12:23:11 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 C43321065672 for ; Thu, 29 May 2008 12:23:11 +0000 (UTC) (envelope-from pjd@garage.freebsd.pl) Received: from mail.garage.freebsd.pl (chello087206046210.chello.pl [87.206.46.210]) by mx1.freebsd.org (Postfix) with ESMTP id 1A8AF8FC18 for ; Thu, 29 May 2008 12:23:11 +0000 (UTC) (envelope-from pjd@garage.freebsd.pl) Received: by mail.garage.freebsd.pl (Postfix, from userid 65534) id 24E6E45CD8; Thu, 29 May 2008 13:52:53 +0200 (CEST) Received: from localhost (pjd.wheel.pl [10.0.1.1]) (using TLSv1 with cipher DHE-RSA-AES256-SHA (256/256 bits)) (No client certificate requested) by mail.garage.freebsd.pl (Postfix) with ESMTP id 767F845C8A; Thu, 29 May 2008 13:52:49 +0200 (CEST) Date: Thu, 29 May 2008 13:52:50 +0200 From: Pawel Jakub Dawidek To: Zaphod Beeblebrox Message-ID: <20080529115250.GD3159@garage.freebsd.pl> References: <16a6ef710805240926t3b4f631bja349fed8df6785ff@mail.gmail.com> <5f67a8c40805241308s15c98737w29bd66c0273bfe95@mail.gmail.com> Mime-Version: 1.0 Content-Type: multipart/signed; micalg=pgp-sha1; protocol="application/pgp-signature"; boundary="P+33d92oIH25kiaB" Content-Disposition: inline In-Reply-To: <5f67a8c40805241308s15c98737w29bd66c0273bfe95@mail.gmail.com> User-Agent: Mutt/1.4.2.3i X-PGP-Key-URL: http://people.freebsd.org/~pjd/pjd.asc X-OS: FreeBSD 8.0-CURRENT i386 X-Spam-Checker-Version: SpamAssassin 3.0.4 (2005-06-05) on mail.garage.freebsd.pl X-Spam-Level: X-Spam-Status: No, score=-5.9 required=3.0 tests=ALL_TRUSTED,BAYES_00 autolearn=ham version=3.0.4 Cc: Andrew Hill , freebsd-stable@freebsd.org, Arnaud Houdelette Subject: Re: ZFS on root and disk write caching. 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: Thu, 29 May 2008 12:23:11 -0000 --P+33d92oIH25kiaB Content-Type: text/plain; charset=us-ascii Content-Disposition: inline Content-Transfer-Encoding: quoted-printable On Sat, May 24, 2008 at 04:08:28PM -0400, Zaphod Beeblebrox wrote: > On Sat, May 24, 2008 at 12:26 PM, Andrew Hill wrote: >=20 >=20 > > but what struck me as odd is the desire to create two separate zpools -= one > > for data storage and one for the system. i think one of zfs's greatest > > strengths is the abstraction/separation between disks and filesystems. >=20 >=20 > There are a few reasons to consider more than one zpool. One is > performance. Another is the ability to boot from it (AFAIK, you can only > boot from mirror'd pools). The ZFS abstraction is cool --- but it's not > magic. There is no ZFSboot support committed. You can only have root file system on ZFS and /boot/ on UFS. In this case you can put your root file system on any kind of pool. The reason for multiple pools is data importance. You may have a pool with no redundancy at all for unimportant data, then you can have another pool with RAIDZ2 for more important data and at the end mirrored pool on top of encrypted disks for secret data. --=20 Pawel Jakub Dawidek http://www.wheel.pl pjd@FreeBSD.org http://www.FreeBSD.org FreeBSD committer Am I Evil? Yes, I Am! --P+33d92oIH25kiaB Content-Type: application/pgp-signature Content-Disposition: inline -----BEGIN PGP SIGNATURE----- Version: GnuPG v2.0.4 (FreeBSD) iD8DBQFIPpkRForvXbEpPzQRAkGdAKD3WH7ixEEI2asRZ2M/AInlMkQbEACgiM3V uUQxqsy2WThVtz3mA4Y2fl8= =B/SB -----END PGP SIGNATURE----- --P+33d92oIH25kiaB--