Grub question (Ahem....help! Now it just says 'GRUB')

Otto Haliburton ottohaliburton at comcast.net
Tue Sep 28 02:37:43 UTC 2004



> -----Original Message-----
> From: redhat-install-list-bounces at redhat.com [mailto:redhat-install-list-
> bounces at redhat.com] On Behalf Of Bob McClure Jr
> Sent: Monday, September 27, 2004 8:59 PM
> To: Mark Knecht; Getting started with Red Hat Linux
> Subject: Re: Grub question (Ahem....help! Now it just says 'GRUB')
> 
> On Mon, Sep 27, 2004 at 05:25:00PM -0700, Mark Knecht wrote:
> > > > I'm confused about this.
> > > >
> > > > 1) I thought grub was in /dev/hda5.
> > >
> > > grub.conf is.
> >
> > OK, I now see Imissed on important piece of info. SC7 was installed in
> > the MBR, and grub was installed (I think) on hda5. The boot process is
> > to boot SC7, and then from SC7 choose Windows or Linux. If Linux, then
> > it jumps to grub and I get the grub choices.
> 
> I figured you'd have to complicate things. :-)
> 
> > > > /dev/hda5 is marked as bootable, not hda7.
> > >
> > > I think that's irrelevant to GRUB.  Only your BIOS cares about that.
> > >
> > > > The machine has been booted since I moved hda5 and hda6. Why
> > > > did moving hda7 make any difference at all?
> > >
> > > I don't know.  Rick probably does.
> > >
> > > > 2) What do I do to get the machine booting again?
> > >
> > > I'd say to boot with your distro disk #1 into rescue mode, let it
> > > mount your system on /mnt/sysimage, pop out the CD, and then
> > >
> > >  chroot /mnt/sysimage
> > >  grub-install /dev/hda
> >
> > This, I think, would put grub in the MBR, wouldn't it?
> 
> Yes.  I've seen precious few reasons not to.  Yours may be one.
> 
> > If so that's
> > not what I want to do, or at least I think I don't. I still want to
> > boot SC7 first. How about
> >
> > grub-install /dev/hda5? (Or should it be hda7 since that's the
> > partition that caused the problem when I moved it. That'swhat I'm
> > confused about. What did grub really put on /dev/hda7?
> >
> > Or possibly grub really is on /dev/hda5, which moved successfully, but
> > then moving hda7 caused grb to get confused? Does grub look at the
> > actual location that the root partition exists at, or does it just use
> > the partition number. (What I thought...)
> 
> That's beyond my level of expertise.  Rick Stevens can chime in here.
> The most important thing I can guess is that GRUB should be installed
> on whichever partition is marked bootable.  (Yeah, now it matters, I
> think.)  I still can't say which partition it should be.  The Fine
> Manual
> 
> http://www.redhat.com/docs/manuals/linux/RHL-9-Manual/ref-guide/s1-grub-
> installing.html
> 
> addresses only installing to the MBR.  But by extrapolating from the
> rest of the documentation, if I had to bet, I'd say install to the
> partition that is mounted on /boot.  IIRC, that makes it /dev/hda5,
> and that correlates with everything else you've said.
> 
> > >  exit
> > >  exit
> > >
> > > That should fix it.
> > >
> > > > I've loaded Knoppix and all the partitions are there. They are in
> teh
> > > > same order they were in before. All the data appears top still be
> > > > there, although you cannot see grub so that part I'm not sure about.
> > > >
> > > > Guru level guidance warmly appreciated.
> > >
> > > I don't qualify.  Sorry.  But let us know if that works.  I'm still
> > > learning.
> > >
> > > > thanks,
> > > > Mark
> > >
> > > Cheers,
> >
> > Thanks Bob!
> 
> Hope that helps.
> 
> Cheers,
> --
> Bob McClure, Jr.             Bobcat Open Systems, Inc.
> robertmcclure at earthlink.net  http://www.bobcatos.com
> Grace happens.
> 
You need to do a grub-install.  You have confused grub, it does not know or
care what partition is bootable, but it has to know where grub.conf is
located so when you changed the partition you didn't change grub.conf so
hence you need to do a grub install.  So that grub can locate grub.conf






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