From owner-freebsd-doc@FreeBSD.ORG Sun Jun 10 17:36:01 2012 Return-Path: Delivered-To: doc@FreeBSD.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:4f8:fff6::34]) by hub.freebsd.org (Postfix) with ESMTP id 3DB50106566C for ; Sun, 10 Jun 2012 17:36:01 +0000 (UTC) (envelope-from hrs@FreeBSD.org) Received: from mail.allbsd.org (gatekeeper.allbsd.org [IPv6:2001:2f0:104:e001::32]) by mx1.freebsd.org (Postfix) with ESMTP id 49CD48FC12 for ; Sun, 10 Jun 2012 17:36:00 +0000 (UTC) Received: from alph.allbsd.org (p4242-ipbf1504funabasi.chiba.ocn.ne.jp [118.7.211.242]) (authenticated bits=128) by mail.allbsd.org (8.14.5/8.14.5) with ESMTP id q5AHZi1l057571; Mon, 11 Jun 2012 02:35:54 +0900 (JST) (envelope-from hrs@FreeBSD.org) Received: from localhost (localhost [IPv6:::1]) (authenticated bits=0) by alph.allbsd.org (8.14.4/8.14.4) with ESMTP id q5AHZhYs097475; Mon, 11 Jun 2012 02:35:43 +0900 (JST) (envelope-from hrs@FreeBSD.org) Date: Mon, 11 Jun 2012 02:35:08 +0900 (JST) Message-Id: <20120611.023508.1263812254934762332.hrs@allbsd.org> To: wblock@wonkity.com From: Hiroki Sato In-Reply-To: References: <20120610.231555.975873460722378457.hrs@allbsd.org> X-PGPkey-fingerprint: BDB3 443F A5DD B3D0 A530 FFD7 4F2C D3D8 2793 CF2D X-Mailer: Mew version 6.4.50 on Emacs 23.4 / Mule 6.0 (HANACHIRUSATO) Mime-Version: 1.0 Content-Type: Multipart/Signed; protocol="application/pgp-signature"; micalg=pgp-sha1; boundary="--Security_Multipart(Mon_Jun_11_02_35_08_2012_025)--" Content-Transfer-Encoding: 7bit X-Virus-Scanned: clamav-milter 0.97.4 at gatekeeper.allbsd.org X-Virus-Status: Clean X-Greylist: Sender succeeded SMTP AUTH, not delayed by milter-greylist-4.2.7 (mail.allbsd.org [133.31.130.32]); Mon, 11 Jun 2012 02:35:54 +0900 (JST) X-Spam-Status: No, score=-98.8 required=13.0 tests=CONTENT_TYPE_PRESENT, RCVD_IN_RP_RNBL,USER_IN_WHITELIST autolearn=no version=3.3.2 X-Spam-Checker-Version: SpamAssassin 3.3.2 (2011-06-06) on gatekeeper.allbsd.org Cc: doc@FreeBSD.org Subject: Re: Handbook mirroring section X-BeenThere: freebsd-doc@freebsd.org X-Mailman-Version: 2.1.5 Precedence: list List-Id: Documentation project List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Sun, 10 Jun 2012 17:36:01 -0000 ----Security_Multipart(Mon_Jun_11_02_35_08_2012_025)-- Content-Type: Text/Plain; charset=us-ascii Content-Transfer-Encoding: 7bit Warren Block wrote in : wb> On Sun, 10 Jun 2012, Hiroki Sato wrote: wb> > The location of the backup header is recorded in the Backup LBA field wb> > in the primary header, so everything will work fine as long as the wb> > pre-boot programs support it and the primary header is not corrupted. wb> > I do not think this situation is against standards conformance though wb> > it is suboptimal. wb> wb> It would certainly make things a lot simpler. gpart would need wb> modification. No modification is needed. gpart already supports it for a long time. wb> > If we can teach GEOM to BIOS and/or UEFI it would be the best, but it wb> > is not likely. wb> wb> > What I want to know is whether there are some practical difficulties wb> > when we apply the whole-disk mirroring procedure for MBR to a wb> > GPT-based system. Overwrite of the last LBA should not happen if wb> > FreeBSD is the only one system on the disk. One common failure wb> > scenario is when the primary header is corrupted. If there are more, wb> > I want to know it. wb> wb> I tried a whole-disk GPT mirror for a short time, and had no problems wb> other than gptboot complaining about the corrupted secondary header. wb> It was not an exhaustive test, though. Can you try 9-STABLE after Apr 26? The warning should not appear. -- Hiroki ----Security_Multipart(Mon_Jun_11_02_35_08_2012_025)-- Content-Type: application/pgp-signature Content-Transfer-Encoding: 7bit -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.11 (FreeBSD) iEYEABECAAYFAk/U2swACgkQTyzT2CeTzy0TJACgjmKLrs+UVZqpeWEe9bi7z+sx VagAoLWrGQfGwO63gfD61kGFLIpJkDU9 =viP7 -----END PGP SIGNATURE----- ----Security_Multipart(Mon_Jun_11_02_35_08_2012_025)----