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Storage : Aggregates : Understanding aggregates : What a matching spare is
What a matching spare is
A matching hot spare exactly matches several characteristics of a designated data disk. Understanding what a matching spare is, and how Data ONTAP selects spares, enables you to optimize your spares allocation for your environment.
A matching spare is a disk that exactly matches a data disk for all of the following criteria:
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Effective Data ONTAP disk type
The effective disk type can be affected by the value of the raid.mix.hdd.performance and raid.mix.hdd.capacity options, which determine the disk types that are considered to be equivalent.
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Size
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Speed (RPM)
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Checksum type (BCS or AZCS)

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