Choosing a system refresh method
The system refresh procedure you use depends on the platform model, and type of MetroCluster configuration. Refresh procedures apply to the controllers and the storage shelves. In the refresh procedures, new controllers and shelves are added to the MetroCluster configuration, creating a second DR group, and then data is nondisruptively migrated to the new nodes. The original controllers are then retired.
Supported MetroCluster FC tech refresh combinations

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You must complete the tech refresh procedure before adding a new load.
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Supported MetroCluster IP tech refresh combinations

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You must complete the tech refresh procedure before adding a new load.
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Refresh method | Configuration type | ONTAP version | Procedure |
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Four-node FC |
9.6 and later |
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Four-node IP |
9.8 and later |