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Client applications report higher space usage than ONTAP
https://kb.netapp.com/on-prem/ontap/Ontap_OS/OS-KBs/Client_applications_report_higher_space_usage_than_ONTAP
Applies to ONTAP 9 Issue Client applications, such as databases or hypervisors, report a high amount of space used in a volume. ONTAP df output shows far less space used.

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