I think i'm going to do it this way:
Make a normal partition.
Install debian on it.
Create an other partition. type : 8e (linux lvm)
Then mount the root partition to it!!
Then I will have a normal boot partition and an logical volume root partition.
And then a can put a raid1 over it!!
Can enyone confirm if this can be done??
I know howto, but does it works??