From owner-freebsd-hackers@FreeBSD.ORG Sat Sep 15 05:24:22 2012 Return-Path: Delivered-To: freebsd-hackers@freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:4f8:fff6::34]) by hub.freebsd.org (Postfix) with ESMTP id 11B48106564A for ; Sat, 15 Sep 2012 05:24:22 +0000 (UTC) (envelope-from yuri@rawbw.com) Received: from shell0.rawbw.com (shell0.rawbw.com [198.144.192.45]) by mx1.freebsd.org (Postfix) with ESMTP id EDBDB8FC08 for ; Sat, 15 Sep 2012 05:24:21 +0000 (UTC) Received: from eagle.yuri.org (stunnel@localhost [127.0.0.1]) (authenticated bits=0) by shell0.rawbw.com (8.14.4/8.14.4) with ESMTP id q8F5OKpb007069; Fri, 14 Sep 2012 22:24:21 -0700 (PDT) (envelope-from yuri@rawbw.com) Message-ID: <50541103.6050608@rawbw.com> Date: Fri, 14 Sep 2012 22:24:19 -0700 From: Yuri User-Agent: Mozilla/5.0 (X11; FreeBSD amd64; rv:15.0) Gecko/20120912 Thunderbird/15.0.1 MIME-Version: 1.0 To: Warren Block References: <5053C9A1.3030605@rawbw.com> In-Reply-To: Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit Cc: freebsd-hackers@freebsd.org Subject: Re: Why fdisk can't open root disk with MBR for writing? X-BeenThere: freebsd-hackers@freebsd.org X-Mailman-Version: 2.1.5 Precedence: list List-Id: Technical Discussions relating to FreeBSD List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Sat, 15 Sep 2012 05:24:22 -0000 On 09/14/2012 19:23, Warren Block wrote: > Did you actually try gpart? GEOM prevents writes to providers that > are in use, but gpart should handle it correctly if the problem is > just that fdisk doesn't understand GEOM. > > # gpart set -a active -i 1 ada0 > > If that fails, the provider is in use, usually mounted. The safety > can be disabled, but it's better to figure out what has it in use. Yes it is the hard drive with mounted /. But changing the active slice should be safe in any case. gpart worked. This safety feature is protecting people from themselves. Sounds very familiar. Thanks! Yuri