Comment # 6 on bug 1230345 from Ruediger Oertel

s390zl21:~ # df -hT /boot2
Filesystem                                    Type  Size  Used Avail Use%
Mounted on
/dev/mapper/3600507630bffd2160000000000002000 ext2  4.0G  340M  3.4G   9%
/boot2

vs

s390zl21:~ # df -hT /boot2
Filesystem     Type  Size  Used Avail Use% Mounted on
/dev/sdb       ext2  4.0G  340M  3.4G   9% /boot2


I really do not understand the difference.