Date: Sat, 15 Nov 2003 01:41:33 +0000 From: Josef Karthauser <joe@FreeBSD.org> To: Poul-Henning Kamp <phk@phk.freebsd.dk> Cc: current@FreeBSD.org Subject: Re: Using Geom to mirror root partitions? Message-ID: <20031115014133.GB31237@genius.tao.org.uk> In-Reply-To: <9494.1068852730@critter.freebsd.dk> References: <20031114232009.GA31237@genius.tao.org.uk> <9494.1068852730@critter.freebsd.dk>
next in thread | previous in thread | raw e-mail | index | archive | help
--GRPZ8SYKNexpdSJ7 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline Content-Transfer-Encoding: quoted-printable On Sat, Nov 15, 2003 at 12:32:10AM +0100, Poul-Henning Kamp wrote: > In message <20031114232009.GA31237@genius.tao.org.uk>, Josef Karthauser w= rites: >=20 > >I've got a machine with two drives 120gb drives, which is going to a > >colo. If I configure it to use one drive, will I at some point be able > >to remotely reconfigure it to say use the second drive as a mirror as > >the physical layer, i.e. if the first drive goes bang then I can get the > >second drive to boot via the bios and still have the machine work - or > >am I dreaming? >=20 > The main problem here (currently) is the bootblocks and /etc/fstab. >=20 > We had some work on geom_mirror recently which I have not yet had > time to look at. If that is done right, it should be possible to > set it up like you say. >=20 > In order to "fool" the bootblocks, geom_mirror would have to be able > to use a meta-data sector at the end of the partition rather than at > the beginning. With that in place it should "just work", since the > device in /etc/fstab would then be the geom_mirror device and GEOM > should be able to offer that for root mounting. >=20 What's the best way to prepare for this? Should I leave some unallocated space at the beginning of the disk so that any magic geom bits can be inserted later? Joe --=20 Josef Karthauser (joe@tao.org.uk) http://www.josef-k.net/ FreeBSD (cvs meister, admin and hacker) http://www.uk.FreeBSD.org/ Physics Particle Theory (student) http://www.pact.cpes.sussex.ac.uk/ =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D An eclectic mix of fact an= d theory. =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D --GRPZ8SYKNexpdSJ7 Content-Type: application/pgp-signature Content-Disposition: inline -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.2.3 (FreeBSD) iEYEARECAAYFAj+1hEwACgkQXVIcjOaxUBaTUgCglhIiDiXx8feXY0DZztJXg3Pc Xv8An08oHL4Ylub+4ECG869PNesEPEnK =6UIn -----END PGP SIGNATURE----- --GRPZ8SYKNexpdSJ7--
Want to link to this message? Use this URL: <https://mail-archive.FreeBSD.org/cgi/mid.cgi?20031115014133.GB31237>