[Storage] LVM을 통한 RAID 구성

https://www.simonmott.co.uk/2016/07/growing-my-linux-raid5-array/

http://www.tecmint.com/create-raid-6-in-linux/

# yum install mdadm		[on RedHat systems]
# apt-get install mdadm 	[on Debain systems]

1. Create a partition on the new drive to be inserted
2. Add the new drive to my array
3. Grow the array
4. Add the free space to LVM
5. Grow the logical volume
6. Resize ext4 to make use of the new space