partitionning array

Hello, I am actually having difficulties with formatting a 7.2 To raid 6 array created by my 3805 with 6 Seagate drives. I have launched Parted Magic 9.5 using theirl ive cd. No way to create 2 3.6 To partitions so I tried to make 4 smaller Partitions. I could easily create 2 ext4...