Supermicro X12 Series User Manual page 28

Super Intel VROC RAID Configuration for the X12 Motherboards User's Guide
After marking the selected drive as Spare, a pop-up window will display to confirm if you want
to mark the selected device as spare. Select Yes and press <Enter> to make the selected drive
as a spare drive. If you do not want to make the selected drive as a spare drive, select No and
press <Enter>.
Note: A spare disk is used for automatic RAID volume rebuilds when the status of
"failed", "missing", or "at risk" is detected on the array disk. For a RAID0 volume, only
the status of "at risk" will trigger automatic RAID volume rebuilds.
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