Why do du, df, and ls show different results for the same disk block?

Solution Verified - Updated -

Issue

  • After creating vmcore crash image, disk block shows different size for the occupied area.
  • Why it does not show the same output among du -s, df, and ls?

Environment

  • Red Hat Enterprise Linux 6
  • Red Hat Enterprise Linux 5
  • Red Hat Enterprise Linux 4
  • Red Hat Enterprise Linux 3

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