Create the partitions
fdisk /dev/sdb
mdadm --create /dev/md0 --level=1 --raid-devices=2 /dev/sdb1 /dev/sdc1
mdadm --create /dev/md1 --level=1 --raid-devices=2 /dev/sdb2 /dev/sdc2
cat /proc/mdstat
mkfs.ext3 /dev/md0
mkfs.ext4 /dev/md1
mkdir /mnt/md0
mkdir /mnt/md1
mount /dev/md0 /mnt/md0/
mount /dev/md1 /mnt/md1/
cd /home
tar c * | tar x -C /mnt/md1
blkid
/dev/md1: UUID="3968404e-6571-4671-a157-9113a9f2fcba" TYPE="ext4"
emacs /etc/fstab
# /home was on /dev/sda9 during installation
UUID=3968404e-6571-4671-a157-9113a9f2fcba /home ext3 defaults 0 2