Acer AR380 F1 - Manual (Page 142)

Appendix A: Server management tools 124
8 Now that the RAID volume is created, you can press 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.