Comment 14 for bug 687501

grub-probe in the proposed package manages to actually use multipath's /dev/mapper/* files. Comparing /boot/grub/grub.cfg from this grub package to the one using blkid in place of grub-probe produces the following diff:

root@kickseed:/root# diff grub.cfg.new grub.cfg.serge
58,59c58
< insmod ext2
< set root='(hd5,1)'
---
> insmod ext4
66,67c65
< insmod ext2
< set root='(hd5,1)'
---
> insmod ext4
76,77c74
< insmod ext2
< set root='(hd5,1)'
---
> insmod ext4
84,85c81
< insmod ext2
< set root='(hd5,1)'
---
> insmod ext4
96,97c92
< insmod ext2
< set root='(hd5,1)'
---
> insmod ext4
102,103c97
< insmod ext2
< set root='(hd5,1)'
---
> insmod ext4

I'm having some trouble getting reliable good boots on the system, but I don't think that's due to this grub package. So as long as having grub.cfg call an ext4 fs 'ext2' is ok (and adding the 'set root=' line, for some reason) I would call this confirmed.