Hi While using UUIDs for lvm2 logical volumes works within grub2 itself, it does blow up in the initramfs integration hooks of lvm2:
http://anonscm.debian.org/viewvc/pkg-lvm/lvm2/trunk/debian/initramfs-tools/lvm2/scripts/local-top/lvm2?view=markup [line 40ff] # Make sure that we have a d-m path dev="${dev#/dev/mapper/}" if [ "$dev" = "$1" ]; then return 1 fi so without a root=/dev/mapper/[...] definition for the rootfs, the default provider of linux-initramfs-tool in Debian never even tries to assemble the volume groups that make up the rootfs. Out of curiosity I rigged that particular regexp to be always false, but lvm2 didn't manage to find a rootfs on a logical volume then either (complaining that UUIDs were not valid for logical volumes). Accordingly there would be several changes and versioned dependencies (Breaks) needed to the lvm2 initramfs-tools hooks, before using anything but /dev/mapper/... rootfs definitions might be viable for grub2. Regards Stefan Lippers-Hollmann
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