From owner-freebsd-current@FreeBSD.ORG Wed Jul 16 05:37:18 2008 Return-Path: Delivered-To: current@freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:4f8:fff6::34]) by hub.freebsd.org (Postfix) with ESMTP id A3B351065674; Wed, 16 Jul 2008 05:37:18 +0000 (UTC) (envelope-from mark@legios.org) Received: from bade.legios.org (ppp198-172.static.internode.on.net [59.167.198.172]) by mx1.freebsd.org (Postfix) with ESMTP id 2EF058FC13; Wed, 16 Jul 2008 05:37:18 +0000 (UTC) (envelope-from mark@legios.org) Received: from localhost (unknown [192.168.0.17]) by bade.legios.org (Postfix) with ESMTP id C49D31A9CC0; Wed, 16 Jul 2008 15:11:35 +1000 (EST) X-Virus-Scanned: amavisd-new at legios.org Received: from bade.legios.org ([192.168.0.17]) by localhost (legios.org [192.168.0.17]) (amavisd-new, port 10024) with ESMTP id 3E1-LQstT6UY; Wed, 16 Jul 2008 15:11:18 +1000 (EST) Received: from www.legios.org (unknown [192.168.0.14]) (using TLSv1 with cipher DHE-RSA-AES256-SHA (256/256 bits)) (No client certificate requested) by bade.legios.org (Postfix) with ESMTP id 56DE31A9C92; Wed, 16 Jul 2008 15:11:18 +1000 (EST) Received: from 210.11.57.37 (SquirrelMail authenticated user mark) by www.legios.org with HTTP; Wed, 16 Jul 2008 15:11:18 +1000 (EST) Message-ID: In-Reply-To: <20080715095139.GA62764@server.vk2pj.dyndns.org> References: <200807131153.m6DBrDkX067657@repoman.freebsd.org> <487C6A86.20508@FreeBSD.org> <20080715095139.GA62764@server.vk2pj.dyndns.org> Date: Wed, 16 Jul 2008 15:11:18 +1000 (EST) From: mark@legios.org To: "Peter Jeremy" User-Agent: SquirrelMail/1.4.15 MIME-Version: 1.0 Content-Type: text/plain;charset=iso-8859-1 Content-Transfer-Encoding: 8bit X-Priority: 3 (Normal) Importance: Normal Cc: Remko Lodder , src-committers@freebsd.org, Pawel Jakub Dawidek , "current@freebsd.org" Subject: Re: geom_mirror silently upgrading metadata [Was: cvs commit: src UPDATING] X-BeenThere: freebsd-current@freebsd.org X-Mailman-Version: 2.1.5 Precedence: list List-Id: Discussions about the use of FreeBSD-current List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Wed, 16 Jul 2008 05:37:19 -0000 > >>IMHO metadata update should be performed if and only if explicitly >>requested by the administrator. > > Agreed. It's especially worrying that there's absolutely no warning > that a particular version of geom_mirror has a different metadata > format and loading it will make your gmirror unusable with an older > gmirror. IMHO, any geom changes changes that prevent reversion > should be noted in UPDATING (at the very least). > Seconded. ZFS appears to have functionality similar to this whereby you can perform an upgrade using zpool upgrade to update the metadata. (Also, on loading zfs.ko it notifies you of the ZFS version it is/supports)