NetApp
Storage > Aggregates : Managing 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 disks from another pool or allow System Manager to select the disks to mirror the aggregate.
5.
Click Mirror.