Date: Fri, 06 Mar 2009 15:16:41 +0100 From: Ivan Voras <ivoras@freebsd.org> To: freebsd-hackers@freebsd.org Subject: Re: How to tear down a geom mirror? Message-ID: <gorb8u$9v2$1@ger.gmane.org> In-Reply-To: <20090306140850.GA62926@stack.nl> References: <17738942.121236320716364.JavaMail.HALO$@halo> <17349951.141236320867093.JavaMail.HALO$@halo> <20090306140850.GA62926@stack.nl>
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[-- Attachment #1 --] Jilles Tjoelker wrote: > 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. Or simply use the "clean" command, for example "gmirror clean" (also supported in other GEOM classes). [-- Attachment #2 --] -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.6 (GNU/Linux) Comment: Using GnuPG with Mozilla - http://enigmail.mozdev.org iD8DBQFJsTBQldnAQVacBcgRAqzXAJ92e0UPnKhK6chYE7fCgfdOWJ5/cwCgjuF5 7bCmyILdvVH/oI4rDmval88= =hz3t -----END PGP SIGNATURE-----
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