Why does the df command not show correct values for cifs mounted volumes when served by NAS such as NetApp filer?

Solution Verified - Updated -

Issue

  • On RHEL system the usage reported by df command.
  /cifs-share/ shows usage as 95% 
  • On NetApp system,
  /cifs-share/ shows usage as 73%

Environment

  • Red Hat Enterprise Linux 7
  • Red Hat Enterprise Linux 8
  • CIFS/SMB2
  • NAS (e.g. NetApp Filer)

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