Ability to reduce Aggregate Snapshot Reserve on FSxONTAP

You cannot reduce the aggregate snapshot reserve with FSx for ONTAP file systems. Just as with on-premises and Cloud Volumes ONTAP (CVO), the aggregate snapshot reserve is used to ensure data remains synchronized between the preferred and standby file servers of FSx for ONTAP Multi-AZ and Single-AZ file systems, and is specifically necessary during failover events to ensure rapid failover and failback. You can read about the aggregate snapshot reserve at Managing aggregate snapshot copies in the NetApp Documentation Center.