Re: AW: [Xen-users] debian Lenny -> Squeeze domU mdX software raidmigration - failed to assemble arrays

[Simon Hobson <linux@xxxxxxxxxxxxxxxx>]

netz-haut - stephan seitz wrote:

> to make transitions more convenient, I've done this by using uuid 
> instead of device names.
> If you ls -l /dev/disk/by-uuid inside your domU, you'll see something like
>
> lrwxrwxrwx 1 root root 10  5. Mai 07:38 
> 39a2a64b-0716-47ad-92f4-a7437cac54ee -> ../../sda2
> lrwxrwxrwx 1 root root 10  5. Mai 07:38 
> e8b97b59-a790-417c-8231-fe8da8b6e6ee -> ../../sda1
> In /etc/fstab inside the domU, '/dev/sda2' would be replaced by 
> 'UUID=39a2a64b-0716-47ad-92f4-a7437cac54ee' and '/dev/sda1' by 
> 'UUID=e8b97b59-a790-417c-8231-fe8da8b6e6ee'
> If pvgrub or pygrub is used, the devicename needs to be replaced 
> inside the domU in /boot/grub/menu.lst from e.g. 'root=/dev/sda2' to 
> 'root=UUID=39a2a64b-0716-47ad-92f4-a7437cac54ee'
> If, like in your case, the domU kernel is directly booted by a cfg 
> statement, the root statement needs to be changed in the cfg file by 
> using the the same formatting as in the menu.lst above.
> Now, it doesn't matter any longer if the device is called xvda or 
> sda or (ancient but possible) hda.
Would using labels be more convenient ? At least on ext2/3, dunno about others.

If you should move a guest to another host, or rebuild it's 
filesystem for any reason, setting a label on the filesystem is 
probably easier than finding the places (multiple - Dom0 and DomU) 
places the UUID has been used.
--
Simon Hobson

Visit http://www.magpiesnestpublishing.co.uk/ for books by acclaimed
author Gladys Hobson. Novels - poetry - short stories - ideal as
Christmas stocking fillers. Some available as e-books.

_______________________________________________
Xen-users mailing list
Xen-users@xxxxxxxxxxxxxxxxxxx
http://lists.xensource.com/xen-users