Applies to ONTAP 9.5 Issue Storage Efficiency on System Manager also fails to open with an entry doesn't exist (error: 15661) error. The results of volume efficiency show do not show any volumes with ...Applies to ONTAP 9.5 Issue Storage Efficiency on System Manager also fails to open with an entry doesn't exist (error: 15661) error. The results of volume efficiency show do not show any volumes with the phenomenon.