booting fedora 11 from a fedora 10 grub?

[Kevin J. Cummings]

On 09/19/2009 01:19 PM, James Allsopp wrote:
> but why isn't idenitfied by /dev/sda2 like partitions normally are? I'm
> not understanding why a UUID is necessary, as opposed to a standard
> /dev/sd pointer to the root partition.

Jim, look at it this way.  You have a system with 4 different disk
cables, which can support up to 6 different disk devices.  You have a
working system using /dev/sda and /dev/sdb.  You add a new disk drive.
All of a sudden, your system devices are /dev/sda (your *new* drive),
/dev/sdb (your old /dev/sda) and /dev/sdc (your old /dev/sdb).  Now,
even if you *can* find your old root partition, it has names which
reference partitions on the wrong disks.  Your system is broken.

With UUIDs, once you can locate the correct root disk partition, it also
references your old disks via UUID and can find them regardless of their
new device names in the new setup.  All you have to do is reference your
new disk partitions via their UUIDs.

Its the same with, well, suppose your motherboard dies and you replace
it with a new one.  If you are not careful cabling your disks in the new
setup, you'll have the same problems as above, whereas if you use UUIDs,
everything will get found, regardless of where it ends up (once you have
your boot disk identified correctly and booting).

> Basically how can I get this to work?

Use the UUIDs.

> Jim

-- 
Kevin J. Cummings
kjchome at rcn.com
cummings at kjchome.homeip.net
cummings at kjc386.framingham.ma.us
Registered Linux User #1232 (http://counter.li.org)