Deleting a file created on an NFS share using "dd" command with "oflag=direct" doesn't release the space in Red Hat Enterprise Linux

Solution In Progress - Updated -

Issue

  • Deleting a file created on an NFS share using dd command with oflag=direct doesn't release the space in Red Hat Enterprise Linux

Environment

  • Red Hat Enterprise Linux , NFS server
  • kernel-2.6.32-431.1.2.el6.x86_64. or kernel-3.10.0-123.el7.x86_64
  • Direct I/O

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