Launch the PowerShell as Administrator.
PS C:> Import-Module ServerManager
PS C:> Add-WindowsFeature -name FS-Data-Deduplication
PS C:> Import-Module Deduplication
Enable Dedup on volumes.
PS C:> Enable-DedupVolume T:
Verify.
PS C:> Get-DedupVolume
PS C:> Get-DedupVolume | format-list
Pull the trigger.
PS C:> Start-DedupJob –Volume T: –Type Optimization
Check the status.
PS C:> Get-DedupJob