Acer AR380 F1 - Manual (Page 142)

Appendix A: Server management tools 124
8 Now that the RAID volume is created, you can press <ESC> or select
option 5. Exit to exit.
Assigning Hot Spare drive
The Intel onboard SATA RAID Configuration Utility in POST does not
provide the function to assign a hot spare driver. Please assign a hot
spare driver with Intel onboard SATA RAID utility installed in the
operating system.