From the Home tab, double-click the appropriate storage system.
2.
In the navigation pane, click Storage > Volumes.
3.
Select the volume for which you want to run deduplication.
4.
Click Storage Efficiency.
5.
In the Storage Efficiency dialog box, if you are running deduplication on the volume for the first time, run deduplication on the entire volume data by selecting Scan Entire Volume.