[SATLUG] Trying to understand UUID and grub

John Pappas j at jvpappas.net
Thu Nov 20 18:01:21 CST 2008


Your email indicated you were querying via /dev/sdx rather than the explicit
partition number.  Can you include the contents of your /boot/grub/menu.lst
so that I can see what you are talking about?

On Thu, Nov 20, 2008 at 15:11, Charles Mims <chmims at gmail.com> wrote:

> I can see where a disk would have a guid and each partitions on it have a
> different
> guid.  But I am asking for the guid on a partition using *blkid *and
> *vol_id
> *and getting
> two different numbers.  Or at least that is what I think I am  doing.
>
> On Thu, Nov 20, 2008 at 11:29 AM, John Pappas <j at jvpappas.net> wrote:
>
> > I am not using a GUID boot setup (LVM), but I am thinking that you need
> to
> > be using the partition GUID, not the disk GUID.  Try using sdxy where y
> is
> > your root partition.  You may need to specify your boot part GUID as
> well,
> > but I know at least your root partition GUID.
> >
> > On Wed, Nov 19, 2008 at 19:34, Charles Mims <chmims at gmail.com> wrote:
> >
> > > I am trying to understand UUID #.   I understand that it is a unique ID
> > for
> > > a device.
> > > But unfortunately it seems to be able to change for partitions which
> > seems
> > > to be
> > > causing problems with GRUB.   I have tried substituting /dev/sdx but
> that
> > > doesn't
> > > seem to be the solutions.   So I am trying to find out the UUID # for a
> > > partition
> > > so I can use that.    How ever I seem to be getting two different #'s .
> > >
> > > #/sbin/blkid /dev/sdx gives me one UUID #.  Which does not seem to
> change
> > > with
> > > reformating the partition.  However!
> > >
> > > #/sbin/vol_id /dev/sdx returns a different UUID # and that number
> changes
> > > if
> > > the
> > > partition is reformated.
> > >
> > > My concern is that installing a different distro of Linux and lettting
> it
> > > write a new
> > > GRUB to the MBR seems to result in being unable to load the the
> > previously
> > > installed
> > > distro.   Simply copying the old grub  config to the new doesn't seem
> to
> > > work.
> > >
> > > Charles
> > > --
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