You must ensure that the storage systems on which SAN or NAS containers reside meet certain requirements before you enable deduplication for them.
Enabling the NetApp Management Console data protection capability for dynamic resizing of backup volumes allows a backup volume to dynamically resize its physical capacity in the event that the logical amount of over-deduplicated data being transferred from its primary volume exceeds the secondary volume's original physical size.
For more information about deduplication-supported maximum volume sizes on various storage systems running various versions of Data ONTAP, see the latest version of the NetApp Deduplication for FAS and V-Series Deployment and Implementation Guide (TR-3505).