LinuxSA Mailing list archives

  From: Graham Smith <linuxsalist@sonicresolutions.com>
  To  : <davidn@rebel.net.au>
  Date: Thu, 16 Jan 2003 12:17:07 +1030

Re: /boot/grub/stage2 file changes magically.. very weird! (LONG post!)

> I've never used linux raid so my advice is purely theoretical.
> The underlying disk partitions should still be available, e.g. /dev/hda1
> and /dev/hdc1.  You can use cmp on them, whether or not they are mounted.
> There might well be some expected differences, for example describing
> the fact that they are two different halves of a mirrored set.  I would
> expect those differences to be at the start of each disk.  If you get
> differences all over the place either the theory (that you can compare
> mirrors) is wrong or else your mirrors are totally hosed.

Hmm I gave this a try but it looks like the raw parition is unavailable.  I
just end up with:

/dev/hda1/grub/stage2: Not a directory

I can't ls or cat or see anything in the /dev/hda1/ path (which is the
correct partition).  Perhaps the mounting of raid makes these devices
unavailable to view in this way.

>
> Another idea, albeit a dangerous one: you should be able to break your
> mirror by taking one half off-line.  Do so and see which version of the
> file you have.  Then replace the half that's on-line with the half that's
> off-line and see if you have the same file.

Yes this thought did run through my mind.  It will mean a mirror resync when
I hotadd the drive back in but perhaps that in it itself will solve the
problem.  I think this will be my next step.  Thanks again for the
assistance David.

Cheers,
Graham



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