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How Data ONTAP handles a failed disk with a hot spare

Using an available matching hot spare, Data ONTAP can use RAID to reconstruct the missing data from the failed disk onto the hot spare disk with no data service interruption.

If a disk fails and a matching or appropriate spare is available, Data ONTAP performs the following tasks:
Attention: Replace the failed disk or disks with new hot spare disks as soon as possible, so that hot spare disks are always available in the storage system.
Note: If the available spare disks are not the correct size, Data ONTAP chooses a disk of the next larger size and restricts its capacity to match the size of the disk it is replacing.