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Re: raid 1

On Wed, Jul 18, 2007 at 04:47:23PM -0700, Mike Bird wrote:
> On Wednesday 18 July 2007 16:33, Andrew Sackville-West wrote:
> > note the root line (hd0,0). that could just as easily be (hd1,0) or
> > (hd2,0) or (hd3,0). I know I tested it when I built the array, but now
> > you've got me worried that maybe it doesn't work. ack.
> >
> > my pertinent array looks like this:
> >
> >
> > md0 : active raid1 hda1[0] hde1[3] hdg1[2] hdc1[1]
> >       248896 blocks [4/4] [UUUU]
> >
> > and is mounted on /boot.
> >
> > Am I missing something?
> I was under the impression that grub didn't install an mbr
> to the mirror drives unless one did a grub-install to each.
> Typically I grub-install to each of the mirrors and then to
> the master.  I'd be very happy to be proved mistaken on this.

okay, no you're right... the booting is fine so long as you have an
mbr... its the mbr that's the trick. 

so to the OP, you have to get yourself into a bootloader somehow and
unless you actually install the bootloader onto each disk, then no,
you can't just boot up any one disk from a raid1 array. There are
other ways to get to a bootloader though: a grub floppy or cd for
example, or you can just manually install grub to each drive. 

thanks mike!


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