Asus Pedestal/5U Rackmount Server TS500-E4 Server - Manual (Page 144)

6-8 Chapter 6: RAID configuration
6. Select RAID from the Logical Drive menu, then press .
7. Select the RAID level from the menu, then press .
You need at least two identical hard disk drives when creating a RAID 1 set.
8. When creating a RAID 1 set, select DWC from the Logical Drive menu,
then press .
When creating a RAID 0 set, proceed to step 10.
9. Select On to enable the Disk Write Cache setting, then press .
Enabling DWC can improve the performance, but with the risk of data
loss.