NetApp
Storage > Disks : Configuring disks : Creating an aggregate from spare disks

Creating an aggregate from spare disks
You can use the Create Aggregate dialog box to create an aggregate from selected spare disks and provide disk space to one or more FlexVol volumes.
Before you begin 
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Steps 
1.
From the Home tab, double-click the appropriate storage system.
2.
In the navigation pane, click Storage > Disks.
3.
Select at least two spare disks and click Create Aggregate.
Atleast one spare disk must be retained on the system as hot spare.
4.
Specify a name for the aggregate.
5.
Select the RAID type.
The options that are enabled depend on the number of disks selected and if the storage system is a V-Series system.
6.
Click Create.