UUID and Drive Cloning
UUIDs are not hardware-specific but stored in the partition's filesystem. That means cloning a disk or partition with dd will result in the same UUID.
You can assign a new UUID by using:
-
tune2fs -U random <device>(ext2/ext3/ext4) -
xfs_admin -U generate <device>(xfs) -
reiserfstune -u $(uuidgen) <device>(reiserfs) -
mkswap -U $(uuidgen) <device>(swap)
Having duplicated UUIDs doesn't necessarily lead to errors. However booting and mounting a device by UUID will become ambiguous and may lead to the wrong device being used.