Prepare and create a RAID5 Array of 5 * 4TB Segate Barracuda Disks

 We need to prepare the disks as GPT labeled as they are > 2TB.

For each disk:

• parted -a optimal /dev/sdx
• mklabel gpt
• mkpart primary 0% 100%
• set 1 raid on
• align-check optimal 1
• print
• quit

Create the array:

• mdadm --create /dev/md0 --level=raid5 --raid-devices=5 /dev/sdx1 /dev/sdx1 /dev/sdx1 /dev/sdx1 /dev/sdx1 

In all of the above replace /dev/sdx1 with appropriates devices, e.g /dev/sda1 /dev/sda2 etc.