On Sat, Nov 15, 2003 at 12:32:10AM +0100, Poul-Henning Kamp wrote: > In message <20031114232009.GA31237_at_genius.tao.org.uk>, Josef Karthauser writes: > > >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? > > The main problem here (currently) is the bootblocks and /etc/fstab. > > 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. > > 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. > 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 -- Josef Karthauser (joe_at_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/ ================ An eclectic mix of fact and theory. =================
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