From owner-freebsd-current@FreeBSD.ORG Sat Oct 8 03:01:56 2011 Return-Path: Delivered-To: freebsd-current@freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:4f8:fff6::34]) by hub.freebsd.org (Postfix) with ESMTP id 552C010656AA; Sat, 8 Oct 2011 03:01:56 +0000 (UTC) (envelope-from perryh@pluto.rain.com) Received: from agora.rdrop.com (agora.rdrop.com [IPv6:2607:f678:1010::34]) by mx1.freebsd.org (Postfix) with ESMTP id CFB988FC17; Sat, 8 Oct 2011 03:01:55 +0000 (UTC) Received: from agora.rdrop.com (66@localhost [127.0.0.1]) by agora.rdrop.com (8.13.1/8.12.7) with ESMTP id p9831jRf044546 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-SHA bits=256 verify=NOT); Fri, 7 Oct 2011 20:01:46 -0700 (PDT) (envelope-from perryh@pluto.rain.com) Received: (from uucp@localhost) by agora.rdrop.com (8.13.1/8.12.9/Submit) with UUCP id p9831jnt044545; Fri, 7 Oct 2011 20:01:45 -0700 (PDT) Received: from fbsd81 ([192.168.200.81]) by pluto.rain.com (4.1/SMI-4.1-pluto-M2060407) id AA01736; Fri, 7 Oct 11 19:53:13 PDT Date: Sat, 08 Oct 2011 02:52:21 -0700 From: perryh@pluto.rain.com To: lev@freebsd.org Message-Id: <4e901d55.j0M8m+Tba3WC+Wrp%perryh@pluto.rain.com> References: <1927112464.20111004220507@serebryakov.spb.ru> <4E8B7A27.5070908@quip.cz> <344794801.20111005101957@serebryakov.spb.ru> <4E8C1426.60107@quip.cz> <251861322.20111005125825@serebryakov.spb.ru> <4E8C6E85.90005@quip.cz> <4E8CD662.90202@quip.cz> <4E8D9136.6040200@digsys.bg> <672948039.20111006175334@serebryakov.spb.ru> <4e8f076e.XGNH7dUgsC/mhr1j%perryh@pluto.rain.com> <1646032486.20111007112802@serebryakov.spb.ru> In-Reply-To: <1646032486.20111007112802@serebryakov.spb.ru> User-Agent: nail 11.25 7/29/05 Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit X-Mailman-Approved-At: Mon, 10 Oct 2011 16:17:20 +0000 Cc: daniel@digsys.bg, freebsd-current@freebsd.org, ivoras@freebsd.org, freebsd-geom@freebsd.org Subject: Re: RFC: Project geom-events 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: Sat, 08 Oct 2011 03:01:56 -0000 Lev Serebryakov wrote: > GPT must have backup copy in last sector by standard ... In that case, shouldn't it refuse to install on any provider that is not in fact a disk, so as not to create configurations that cannot work properly? > MBR doesn;t have any additional metadata. How adding one will help it? It would add robustness, for cases like the one that started this thread. If MBR put a GEOM metadata block at the end of its provider, it would fix the tasting race when an MBR is installed on a glabelled (or gmirrored) drive.