ボリュームのボリューム属性「autosize-mode」を「grow_shrink」に変更できません

環境

• ONTAP 9
• System Manager 

問題

Unable to set volume attribute "autosize-mode" for volume "Vol" on Vserver "SVM". Reason: Configuration is not supported. Snapshots may be unnecessarily deleted with the following configuration: volume automatic resize set to 'grow_shrink' and snapshot automatic delete trigger set to 'snap_reserve' or 'space_reserve'.

• Snapshotの自動削除 trigger 設定はsnap_reserve""です。

  Snapshot autodelete settings: state=on, commitment=try,
                trigger=snap_reserve,
                 target_free_space=20%,
                 delete_order=oldest_first, defer_delete=user_created,
                prefix=(not specified),
                 destroy_list=none
  Volume autosize settings: mode=off
  Hybrid Cache: Eligibility=read-write