[gentoo-user] change raid device for existing array

[Thanasis]

I have an existing software raid1 array of two disks, /dev/sda2 and
/dev/sdb2, which has always been /dev/md0 until now. In the same way
there is another device (/dev/md1) also raid1 for /dev/sda6 and /dev/sdb6.
I want to repartition the disks, without booting from livecd, so I will
do it a disk at a time. I just used mdadm to set /dev/sdb2 as faulty
(and the same for /dev/sdb6), so as to free the whole /dev/sdb disk, and
repartitioned it. Rebooted for the kernel to see the new partitions on
/dev/sdb, and now I want to assign a new /dev/md0 using a new partition
on the /dev/sdb drive. But /dev/md0 is already taken from the still
active (old) system.  I know I could use another md device like
/dev/md3, but at the end, I would like to have the md devices start from
md0 as before.

So the Q is: How should I proceed to switch /dev/md0 to a new set of
devices ?
(hope I made myself clear ;-)
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