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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.disktype.enable option, which affects which disk types 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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