Partitioning the drives as “Linux RAID”
Hard Disks section
Once in the partition editor go to the “Hard Disks” section. Once in the hard disks section go to one of the hard drives that is going to be included in a RAID array, then click the “Add…” button.

Formatting and mounting options
Check the “Do not format partition” radio button and then select the partition type “0xFD Linux RAID”. Also, check the “Do not mount partition” radio button. Finally, click on the “Finish” button. Repeat steps 2.1 through 2.3 for all of the hard drives that are going to be included in RAID arrays.

Choose a partition size
Check the “Do not format partition” radio button and then select the partition type “0xFD Linux RAID”. Also, check the “Do not mount partition” radio button. Finally, click on the “Finish” button. Repeat steps 3.1 through 3.3 for all of the hard drives that are going to be included in RAID arrays.

