My suspicion is that it's actually the bootloader that's messed up rather than the logical volumes themselves. (most likely) Grub is configured to point to the old drive, and doesn't find anything there. So what you'll need to do if that's the case is to use grub-setup/grub-install to update the Master Boot Record to know about your new drive, and then possibly the menu.lst to know that the system itself moved too if it doesn't figure that out automatically. - Tony Yarusso