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Storage : Disks : Understanding disks : How Data ONTAP works with hot spare disks
How Data ONTAP works with hot spare disks
A hot spare disk is a disk that is assigned to a storage system but is not in use by a RAID group. It does not yet hold data but is ready for use. If a disk failure occurs within a RAID group, Data ONTAP automatically assigns hot spare disks to RAID groups to replace the failed disks.

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