Asus Pedestal/5U Rackmount Server TS500-E4 Server - Manual (Page 149)

ASUS TS500-E4 6-13
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>.