LVM is greatly extensible and can be set up into Volume Groups.
<x404102> You make an LVM drive array on the drives. Then you partition it in two partitions, 2TB each, for both drives that makes VG volume groups. so you have 4 volume ground A0 A1 B0 B1. You put a RAID 1 on A0 and B0 and a RAID 0 on A1 and B1.
<x404102> It's not really partition it's just volume groups.
<antonizoon> I'll note this down
<x404102> Yeah LVM is recommended it's extensible. You can grow a RAID https://raid.wiki.kernel.org/index.php/Growing