Comment 14 for bug 821466

Ah, ok. So pretty sure this is the result of one patch we carried for EC2. This renames the block devices to sd* even in PV mode. This has been dropped in Natty and maybe can be dropped in Maverick, too. Though generally (since the device name has not been that stable in history), if you can avoid it, I would try to use fs-label or UUIDs instead. I have not verified with UUID but at least label works with pv-grub.