Why does the output of df show 5% less free space than is physically present on a freshly formatted filesystem?

Solution Verified - Updated -

Issue

  • Why does the output of df show 5% less free space than is physically present on a freshly formatted filesystem?
  • How do I change the amount of reserved space on a filesystem?
  • df command is showing filesystem 99% full.

Environment

  • Red Hat Enterprise Linux (RHEL) 4, 5, 6, 7
    • EXT2, EXT3, EXT4 file systems

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