Applies to ONTAP 9 AFF/FAS systems Answer It is not possible to reduce a volume's size below the total amount of data it holds. There will be an impact of snapshots and compression on the amount of sp...Applies to ONTAP 9 AFF/FAS systems Answer It is not possible to reduce a volume's size below the total amount of data it holds. There will be an impact of snapshots and compression on the amount of space that can be reclaimed. If thin provisioning is used, disable space reservation and run space reclamation to free up space.