You can use the Make Spare dialog box to assign spare array LUNs. You can add spare array LUNs to an existing aggregate to increase the size of the aggregate.
Steps
1.
From the home page, double-click the appropriate storage system.
2.
Expand the cluster hierarchy and click Storage > Array LUNs.
3.
Select the array LUNs that you want to assign to the node and click Make Spare.