Hi LifN, when dealing with SW Raid + LVM the best trick is to put /boot in a separate md device (md0 as example), and mark both partitions of the RAID1 as bootable. Then format the resulting md0 as ext2. Then build another md device (md1), and use this one as base of the rest of things using LVM. I'll do a special article on this topic, I've seen that it's a common problem :)