Supermicro X11DPG-QT User Manual page 204

Super X11DPG-QT User's Manual
When the following screen appears, select Yes to confirm that you want the selected device
to be used as a spare device. The options are Yes and No.
Note: A spare disk is used for automatic RAID volume rebuilds when status of failed,
missing, or at risk is detected on the array disk. For a RAID0 volume, only status of
at risk will trigger automatic RAID volume rebuilds.
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