Asus DSBF-DM/SAS - Manual (Page 123)

ASUS DSBF-DM Series 5-13
Press <F10> again, the logical drive information appears including a Logical
Drive menu that allows you to change the logical drive parameters.
6. Select RAID from the Logical Drive menu, then press <Enter>.
7. Select RAID 10 from the menu, then press <Enter>.
You need at least four identical hard disk drives when creating a RAID 10 set.
8. Select DWC from the Logical Drive menu, then press <Enter>.
9. Select On to enable the Disk Write Cache setting, then press <Enter>.