Re: rescue bootable cd ???
Em Qui, 2007-10-04 às 15:32 -0700, David Brodbeck escreveu:
> On Oct 3, 2007, at 6:03 PM, Daniel Burrows wrote:
>
> > On Sat, Sep 29, 2007 at 07:37:10PM -0500, helices
> > <helices@helices.org> was heard to say:
> >> The problem with knoppix cd, and the debian installation/rescue
> >> cd, is
> >> that they do NOT understand the specifics of my lvm over software
> >> raid
> >> 5. The specifics required probably all reside under /etc -- on a
> >> filesystem in lvm on software raid 5.
> >
> > Are you sure this is the case? Software raid and LVM are both
> > kernel
> > things (with userland support utilities), and they're autodetected
> > using
> > magic numbers on the partitions. As long as the kernel is compiled
> > with
> > support, I'd expect them to be accessible. It might be that the
> > autodetection just isn't running on startup; I wonder if some work
> > with
> > mdadm and the LVM utilities would get you access to the volumes.
> > It might
> > at least be worth a try.
>
> I find that LVM-over-RAID is not autodetected by most rescue disks.
> It's necessary to first bring up the RAID array manually with mdadm,
> then run vgscan and vgchange -ay to start up LVM. After that it
> should work fine. I've done this before, but it's been a little
> while and I can't remember the exact command lines I used.
>
>
The problem is grub. Grub has no support for this (lvm over raid)
you need a lilo booter (wich the etch installer installs).
and a lilo based rescue CD.
I was bitten quite often by this problem, therefore I use a /boot
outside of raid/lvm, /boot on one HD, variouos swaps on the others.
after that you can boot with any Grub CD
Michel.
>
>
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