Create physical volumes

Once in Terminal type the following command

su root

and hit enter. This will make the text 

Password:

pop up in terminal. Type your password and hit enter. Note that when typing your password no characters will appear on the screen. This is a security feature built into Linux to prevent somebody watching your screen seeing the length of your password. After typing in your password, type in the command bellow. Replacing /dev/md0 with the names of the RAID devices that were written down in step 3.5. Make sure to run this command once for every RAID device you want to be included in LVM.

pvcreate /dev/md0