From owner-freebsd-fs@FreeBSD.ORG Sun Nov 29 21:28:14 2009 Return-Path: Delivered-To: freebsd-fs@freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:4f8:fff6::34]) by hub.freebsd.org (Postfix) with ESMTP id C284A1065672 for ; Sun, 29 Nov 2009 21:28:14 +0000 (UTC) (envelope-from pjd@garage.freebsd.pl) Received: from mail.garage.freebsd.pl (chello089077043238.chello.pl [89.77.43.238]) by mx1.freebsd.org (Postfix) with ESMTP id 1E95A8FC19 for ; Sun, 29 Nov 2009 21:28:13 +0000 (UTC) Received: by mail.garage.freebsd.pl (Postfix, from userid 65534) id 37E9045D8D; Sun, 29 Nov 2009 20:27:33 +0100 (CET) Received: from localhost (pdawidek.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 7476045685; Sun, 29 Nov 2009 20:27:28 +0100 (CET) Date: Sun, 29 Nov 2009 20:27:26 +0100 From: Pawel Jakub Dawidek To: Olivier Smedts Message-ID: <20091129192726.GX1567@garage.freebsd.pl> References: <4B11C7A1.1040801@andric.com> <367b2c980911290920x570a3164o54fb1b61a65c8189@mail.gmail.com> Mime-Version: 1.0 Content-Type: multipart/signed; micalg=pgp-sha1; protocol="application/pgp-signature"; boundary="+te1M04ZWIfilseV" Content-Disposition: inline In-Reply-To: <367b2c980911290920x570a3164o54fb1b61a65c8189@mail.gmail.com> User-Agent: Mutt/1.4.2.3i X-PGP-Key-URL: http://people.freebsd.org/~pjd/pjd.asc X-OS: FreeBSD 9.0-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=4.5 tests=ALL_TRUSTED,BAYES_00 autolearn=ham version=3.0.4 Cc: freebsd-fs@freebsd.org Subject: Re: raidz configuration X-BeenThere: freebsd-fs@freebsd.org X-Mailman-Version: 2.1.5 Precedence: list List-Id: Filesystems List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Sun, 29 Nov 2009 21:28:14 -0000 --+te1M04ZWIfilseV Content-Type: text/plain; charset=us-ascii Content-Disposition: inline Content-Transfer-Encoding: quoted-printable On Sun, Nov 29, 2009 at 06:20:26PM +0100, Olivier Smedts wrote: > 2009/11/29 Dimitry Andric : > > On 2009-11-28 23:22, Wes Morgan wrote: > >> Simple question: > >> > >> 8 devices in a raidz2 > >> or > >> 4 devices in a raidz x 2 > > > > With the first configuration, any two drives can fail, and all data is > > still preserved. > > > > With the second configuration, if two drives fail within the same RAID > > set, you are screwed. >=20 > A raidz on top of four zfs mirrors would be better (ie raid1+0 vs raid 0+= 1). This can't be configure. And raidz is equivalent of RAID5, not RAID0. --=20 Pawel Jakub Dawidek http://www.wheel.pl pjd@FreeBSD.org http://www.FreeBSD.org FreeBSD committer Am I Evil? Yes, I Am! --+te1M04ZWIfilseV Content-Type: application/pgp-signature Content-Disposition: inline -----BEGIN PGP SIGNATURE----- Version: GnuPG v2.0.4 (FreeBSD) iD8DBQFLEsseForvXbEpPzQRAq6zAKCMhvjBvCvsti4fPREfB7PFNRytTACbB/SZ YxAtG7FSjNfYkFGRe4BJHGE= =fOxc -----END PGP SIGNATURE----- --+te1M04ZWIfilseV--