Date: Wed, 15 Jun 2011 14:05:24 +0200 From: Pawel Jakub Dawidek <pjd@FreeBSD.org> To: "Justin T. Gibbs" <gibbs@scsiguy.com> Cc: fs@FreeBSD.org Subject: Re: [CFR][ZFS] Add "zpool labelclear" command. Message-ID: <20110615120524.GI1975@garage.freebsd.pl> In-Reply-To: <4DF7CDD0.8040108@scsiguy.com> References: <4DF7CDD0.8040108@scsiguy.com>
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--UthUFkbMtH2ceUK2 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline Content-Transfer-Encoding: quoted-printable On Tue, Jun 14, 2011 at 03:08:32PM -0600, Justin T. Gibbs wrote: > ZFS rightfully has a lot of safety belts in place to ward off unintended > data loss. But in some scenarios, the safety belts are so restrictive, > the only way to proceed is to wipe the label information off of a drive. >=20 > Here's an example: >=20 > Pull a drive that is active in a pool on one system and stick it into > another system. ZFS will correctly reject this drive as a member of > a new pool or as the argument of a replace command. But if you really > want to use that drive, how do you clear it's "potentially active" > status? If the pool were imported, you could destroy it, but ZFS wont > allow you to import a pool unless there are sufficient members for it > to serve I/O (I know about the undocumented -F option for import, > but users aren't going to find that). You can use dd to wipe the label > data off, but where exactly does ZFS keep its for copies of the label? In most of the cases like that you can use -f switch, eg. you can create pool or replace vdev using one that is active when you use that switch. I'm sure you are aware of this, so I guess it doesn't always work for you? --=20 Pawel Jakub Dawidek http://www.wheelsystems.com FreeBSD committer http://www.FreeBSD.org Am I Evil? Yes, I Am! http://yomoli.com --UthUFkbMtH2ceUK2 Content-Type: application/pgp-signature -----BEGIN PGP SIGNATURE----- Version: GnuPG v2.0.14 (FreeBSD) iEYEARECAAYFAk34oAQACgkQForvXbEpPzTMPQCfdOF/B55vnF1dEVZpS5/ZFyAd PGQAnR/Mq+I8jT8plWA2axWUoBE9Y+Fc =yrzz -----END PGP SIGNATURE----- --UthUFkbMtH2ceUK2--
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