Roberjp,  The server, as well as the supported controllers, will support the use of dual Raid 1 Virtual Disks. You will need to create the OS one first and then install the OS and create the second one afterwards, on the software controllers. Let me know if this helps.
Is it possible to have a RAID 1 + RAID 1 on the 230? And does it matter which RAID controller? So a total of 4 physical drives: OS on its own RAID 1 using 2 physical drives and data on its own RAID 1 using 2 physical drivers. 
R230 Raid Configuration