Date: Fri, 6 Mar 2009 15:08:50 +0100 From: Jilles Tjoelker <jilles@stack.nl> To: Peter Steele <psteele@maxiscale.com> Cc: freebsd-hackers@FreeBSD.ORG Subject: Re: How to tear down a geom mirror? Message-ID: <20090306140850.GA62926@stack.nl> In-Reply-To: <17349951.141236320867093.JavaMail.HALO$@halo> References: <17738942.121236320716364.JavaMail.HALO$@halo> <17349951.141236320867093.JavaMail.HALO$@halo>
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On Thu, Mar 05, 2009 at 10:27:50PM -0800, Peter Steele wrote: > I've created a USB boot disk that is used to clone itself onto the > systems hard drives, setting up mirrored file systems in the process. > The main difficulty I'm having is reimaging a system with an existing > OS whose drives are already configured in a mirror. I want of course > to destroy the mirror and create a complete new one, but I can't find > the right process to accomplish this reliably. I don't want to make > any assumptions about what mirrors might exist already and I > definitely don't want to do "gmirror load" before I get a chance to > destroy any existing mirrors. > What I am doing is to clean the drive using dd. For example, assume my > target system has two drives ad1 and ad2. I issue the following > commands: > dd if=/dev/zero of=/dev/ad1 bs=512 count=79 > dd if=/dev/zero of=/dev/ad2 bs=512 count=79 gmirror and various other geom modules store their metadata on the last sector(s) of the drive, so you need to wipe that too. -- Jilles Tjoelker
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