same uuid used twice (accidentally, using dd for backup) ->no warning appears

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http://www.linuxforums.org – Hi (this is my first post in any forum ever :-o ) i did somethink wrong: i have ubuntu 9.10 with 2 hdd (flash + normal). i did a backup of / by: dd if=/dev/sda1 of=/dev/sdb1 (both partitions were created before). (i know there a better ways to backup a partitiion, but i did it like that) then i woundered for some days about strange behaviour (grub, disk noise of the non-flash disk, etc) everything was working, but i woundered sometimes - thats why i didnt investigated anything. then i found out, that the linux-kernel has choosen the backup-partition as root-partition (same uuid). what i want to reach: give a warning if the kernel finds two different partitions using same uuid! (there was no hint in the kernel-log about this misconfiguration) of course this was a user-mistake, but i think this could happen to someone else again. its propably only one line of code, but makes linux a little bit more non-expert-friendly - i think. (HowTos)