Acer Altos R720 Series - Manual (Page 182)

Appendix B: SAS hardware RAID configuration 172
9 Click Yes to initialize the new logical drives. The logical drives will
be listed.
10 Click Home to go back to the configuration menu.
11 Now you can reboot the system and install the Operating System.
Select Exit and click Yes.
12 Press <Ctrl+Alt+Del> to reboot the system.
Assigning a hot spare disk
1 Launch the Configuration menu.
2 Select a free disk marked as Ready and listed under Physical Drives.
3 Select Make Hotspare and click Go.
4 Click Home to return to the Configuration menu. The disk will be
marked as Hotspare in pink and listed under Physical Drives.