Supermicro X11DDW-L/NT User Manual page 172

Super X11DDW-L/NT 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 the status of
failed, missing, or at risk is detected on the array disk. For a RAID0 volume, only the
at risk status will trigger automatic RAID volume rebuilds.
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