Why is filesystem size not correct after extending my logical volume?

Solution In Progress - Updated -

Issue

  • After adding 300G to a logical volume the size still shows 1.3T instead of 1.6T from the df output.
# df -h 
Filesystem                                    Size  Used    Avail 
/VolGroup00LogVol00                            1.3T   500G  800G

Environment

  • Red Hat Enterprise Linux 5
  • Red Hat Enterprise Linux 6
  • Red Hat Enterprise Linux 7

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