Date: Wed, 28 Sep 2016 15:02:46 -0400 From: Allan Jude <allanjude@freebsd.org> To: freebsd-current@freebsd.org Subject: Re: Destroy GPT partition scheme absolutely, how? Message-ID: <9b345002-5fb1-5cc3-3a60-9bf872d79d21@freebsd.org> In-Reply-To: <CANCZdfpPPOqT0TFhaYiyEvX3hoq%2B=5Jwxdw8xNJ6NTHKRFFAUg@mail.gmail.com> References: <20160926150109.0d0d793e@hermann> <57E92726.2020605@gmail.com> <5484D815-4B17-456B-BA60-CC6F4E97AFE3@gmail.com> <1785064.lgVzRW13Wf@ralph.baldwin.cx> <C03C20AC-FE67-4D7C-8239-ED48F844EE38@dons.net.au> <CANCZdfp%2BOq7cYz681zYB%2B1DWqXPgxcKN5kn_YdsgfyDNuQoEOQ@mail.gmail.com> <DDEEDE89-AA72-47E8-9D52-A22A79E6CC2B@dons.net.au> <CANCZdfpPPOqT0TFhaYiyEvX3hoq%2B=5Jwxdw8xNJ6NTHKRFFAUg@mail.gmail.com>
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This is an OpenPGP/MIME signed message (RFC 4880 and 3156) --TP80tKuDdF2dFwU24O5Depr353CP14j7A Content-Type: multipart/mixed; boundary="qWCiMF8H2aEPtN4kBTEF4PAURruUbaPdL"; protected-headers="v1" From: Allan Jude <allanjude@freebsd.org> To: freebsd-current@freebsd.org Message-ID: <9b345002-5fb1-5cc3-3a60-9bf872d79d21@freebsd.org> Subject: Re: Destroy GPT partition scheme absolutely, how? References: <20160926150109.0d0d793e@hermann> <57E92726.2020605@gmail.com> <5484D815-4B17-456B-BA60-CC6F4E97AFE3@gmail.com> <1785064.lgVzRW13Wf@ralph.baldwin.cx> <C03C20AC-FE67-4D7C-8239-ED48F844EE38@dons.net.au> <CANCZdfp+Oq7cYz681zYB+1DWqXPgxcKN5kn_YdsgfyDNuQoEOQ@mail.gmail.com> <DDEEDE89-AA72-47E8-9D52-A22A79E6CC2B@dons.net.au> <CANCZdfpPPOqT0TFhaYiyEvX3hoq+=5Jwxdw8xNJ6NTHKRFFAUg@mail.gmail.com> In-Reply-To: <CANCZdfpPPOqT0TFhaYiyEvX3hoq+=5Jwxdw8xNJ6NTHKRFFAUg@mail.gmail.com> --qWCiMF8H2aEPtN4kBTEF4PAURruUbaPdL Content-Type: text/plain; charset=windows-1252 Content-Transfer-Encoding: quoted-printable On 2016-09-27 01:58, Warner Losh wrote: > On Mon, Sep 26, 2016 at 11:06 PM, O'Connor, Daniel <darius@dons.net.au>= wrote: >> >>> On 27 Sep 2016, at 14:28, Warner Losh <imp@bsdimp.com> wrote: >>> dd of 2MB of zeros to the start and end of the disk. That will destro= y >>> pretty much everything. For SSDs, sometimes you can do the same with >>> TRIMs only faster (other times they are slower or unreliable). >> >> Yeah, but it would be nicer to not have to know that particular magic = incarnation :) >=20 > Disk formatting has always been 3 parts magic, 2 parts luck and 1 part = skill :) >=20 > It doesn't fit nicely into geom because metadata can live elsewhere. >=20 > I forgot to add the caveat not to try this on a disk that is part of a > RAID volume. >=20 > Warner > _______________________________________________ > freebsd-current@freebsd.org mailing list > https://lists.freebsd.org/mailman/listinfo/freebsd-current > To unsubscribe, send any mail to "freebsd-current-unsubscribe@freebsd.o= rg" >=20 I wonder if this issue is related at all to the new 'auto resize' gpart bits. That leaves the 'uncommitted' transaction pending, and may require a 'gpart undo' before the other commands will work correctly. I wonder if something like 'zpool labelclear', but for gpart would be useful, that just nukes the first and last few MB of the disk. I know in the installer we jump through a number of hoops to try to clear out old stuff, and having one command would be better. --=20 Allan Jude --qWCiMF8H2aEPtN4kBTEF4PAURruUbaPdL-- --TP80tKuDdF2dFwU24O5Depr353CP14j7A Content-Type: application/pgp-signature; name="signature.asc" Content-Description: OpenPGP digital signature Content-Disposition: attachment; filename="signature.asc" -----BEGIN PGP SIGNATURE----- Version: GnuPG v2.0.22 (MingW32) iQIcBAEBAgAGBQJX7BPZAAoJEBmVNT4SmAt+9wwP/12Nx4GvgByRyN+asAy9IiqM JsS2idfDD0oFzlc0egcKTP1g8iXgepgKoaztenZUiF9XnV2FDJMjQiEWHQgKoNIW HkANJk20+H/y9p0IP558iecXvaO7O3QuOoCZu9V0CUyyk6uh1RpTLBqI+dGzOvqp dxdJg3sesfxqcl8qAM2sjcbJSCCh2HRmBGTbCuuyLJb0RKIlvMel/lSGZcSdJzsK NI4s8E2qOaYTR+Ogju/Z5fuvzphYetu0SOl2PfmVfTHPkBnPBKk5/tdBDu/fRfIW 3JLQrv+H/kAMpX7byTzeSpwxrXf6QqOseWTX/ehwmFbB3BRzaQra97n6FlywWhBf /MKBv1jIRrU4qOVJ0OTVfBv5fw18A6NynVEBpARoUtRuRSEtXz1hKp6mkTgSZM6i Di/VhEXLv2RbR6A5NpgOSHjTYlkE+lYQ5Av7LYe6ZkDTf6YdZGrp8slZal2GVXyc 6zRgQsuofAjOJlu9pKDC1wrM1cTHfartWQQWQVsmJt2tIiex9qahikYkNIXJunN/ zwe6nVmJqgHgHZDgt128r0QIXhk4x6Q2/ReRZiZzX0GCvA5X/7CXmwBvXcp76BW/ JkI7n5y/YlWRW4+Sr9iWxM4OybIierd5Z8drSbOtTxRe0M9HP84OG466WtoBWJxT xNxWs0TukcaDl78GS0J5 =t82n -----END PGP SIGNATURE----- --TP80tKuDdF2dFwU24O5Depr353CP14j7A--
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