Asus RS120-E4/PA4 - Manual (Page 119)

ASUS RS120-E4/PA4 6-13
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 Stripe.Size from the Logical.Drive menu, then press <Enter>.
9. Key-in the stripe size, then press <Enter>.
For server systems, we recommend that you use a lower array block size. For
multimedia computer systems used mainly for audio and video editing, we
recommend a higher array block size for optimum performance.