Why does the df command not show correct values?

Solution Verified - Updated -

Issue

  • df -h command output does not add up correctly. Size <> Used + Avail.

    # df -h
Filesystem      Size      Used      Avail Use% Mounted on
/dev/sda1     101086     53867     42000  57% /boot

Used + Avail is not equal to Size. ie, 53867 + 42000 = 95867. Where is the remaining space?

  • df not reporting space correctly after lvextend and resize2fs

Environment

  • Red Hat Enterprise Linux 4
  • Red Hat Enterprise Linux 5
  • Red Hat Enterprise Linux 6

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