A user wants existing data in a FlexVol created in ONTAP 9.

 You can use either XCP or the in-place conversion feature to move data from a FlexVol volume to a FlexGroup volume. XCP is a data migration tool that can copy data between different types of volumes, such as FlexVol and FlexGroup. The in-place conversion feature, introduced in ONTAP 9.7, allows you to convert a FlexVol volume to a FlexGroup volume without requiring a data copy or additional disk space. However, you cannot convert a FlexGroup volume back to a FlexVol volume. SnapMirror is not a valid option for this scenario, because it does not support replicating data from FlexVol to FlexGroup volumes. A FlexVol to FlexGroup conversion is supported, but only for transitioned volumes starting from ONTAP 9.8. References :- Converting FlexVol volumes to FlexGroup volumes overview, Can a FlexGroup be converted to a FlexVol?, Can I convert a Flexvol to FlexGroup without rewarming the tiered data?