[SATLUG] Trying to understand UUID and grub

John Pappas j at jvpappas.net
Thu Nov 20 11:29:17 CST 2008


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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