# apt-get install mdadm
# apt-get install lvm2

Check existing arrays:
# cat /proc/mdstat

Create RAID 5 array:
mdadm –create –verbose /dev/md0 –level=5 –raid-devices=3 /dev/sdb /dev/sdc /dev/sde

Check the array exists:
# cat /proc/mdstat
=⇒ there is an initial phase of reconstruction when an array is created. It is supposedly functional during this time.