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Cluster : Storage > Disks : Understanding disks : What an appropriate hot spare is
What an appropriate hot spare is
If a disk fails and no hot spare disk that exactly matches the failed disk is available, Data ONTAP uses the best available spare.
Data ONTAP picks a non-matching hot spare based on the following criteria:
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If the available hot spares are not the correct size, Data ONTAP uses one that is the next size up if possible.
Note: The replacement disk is downsized to match the size of the disk it is replacing; the extra capacity is not available.
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If the hot spares are not the correct speed, Data ONTAP uses one that is a different speed.
Note: Using drives with different speeds within the same aggregate is not optimal. Replacing a disk with a slower disk can cause performance degradation, and replacing with a faster disk is not a cost-effective solution.
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The hot spare must be of the same disk type (FC, SAS, and so on) as the failed disk, or of a type that is considered to be equivalent.
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If the hot spares are ZCS disks, they can be added only to zoned checksum aggregates. ZCS disks cannot be added to block checksum aggregates.

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