Mdadm

Create

mdadm --create --verbose /dev/md2 --level=1 --raid-devices=2 /dev/sda2 /dev/sdb2

Remove from array

1. fail mdadm /dev/md0 --fail /dev/hde1 2. remove mdadm /dev/md0 --remove /dev/hde1

Copy via tar

tar cf - . | (cd /work/bkup/jane && tar xBf -)