Date: Thu, 21 Jul 2005 22:56:39 +1000 From: Norberto Meijome <freebsd@meijome.net> To: Stijn Hoop <stijn@win.tue.nl> Cc: FreeBSD Questions <freebsd-questions@freebsd.org> Subject: Re: Bootstrapping Raid 5 w/GEOM Message-ID: <42DF9B87.2000708@meijome.net> In-Reply-To: <20050721124049.GX72402@pcwin002.win.tue.nl> References: <42DF4A96.1080305@meijome.net> <20050721124049.GX72402@pcwin002.win.tue.nl>
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Stijn Hoop wrote: > On Thu, Jul 21, 2005 at 05:11:18PM +1000, Norberto Meijome wrote: > >> >>I want to setup software Raid 5 , and I want it to affect ALL >>partitions, including / (so if any one of the drives fails, it will >>still boot up properly). I am planning on using GEOM, but open to >>suggestions. > > I don't think it's possible -- the loader doesn't know about the mirror > even in a mirrored / setup; it justs treats one of the disks of the mirror > as 'the boot disk'. It's not until the kernel is loaded that gvinum RAID-5 > can do something. Would the same be true (not possible to boot) for a RAID 1 + 0 with GEOM? > So, in your case, the loader would read random RAID-5 data instead of > a kernel and refuse to boot. > > IE, it's not possible until someone writes a RAID-5 capable loader. right - so that's why I couldnt find any reference to this anywhere :) > > I would advise you to either use gmirror for booting, or define a few > gvinum mirror plexes (it is possible to boot from a mirrored gvinum > setup although it's tricky to get right). I guess I could create a boot slice in 2 of the drives, mirror that with gmirror and use that to boot. Then RAID-5 the rest of the drives (minus the size of the boot partition in the other 2 drives of course). cheers, B
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