NetApp
Storage : Aggregates : Configuring aggregates : Mirroring an aggregate

Mirroring an aggregate
You can mirror aggregates to provide a high level of data availability. A mirrored aggregate consists of two plexes and has two copies of its data. You can use the Aggregate window to mirror an aggregate.
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 > Aggregates
3.
Select the aggregate that you want to mirror and click Mirror.
4.
Select the required number of matching spare disks from another pool.
5.
Click Mirror.