Why data write fails beyond the original size after extending the file system?

Solution Unverified - Updated -

Issue

  • After extending a file system online, not able to write data to the new size.

  • df command shows the space is available but write is not possible beyond the initial size

Filesystem            Size  Used Avail Use% Mounted on
[..]
/dev/mapper/Volgroup00-testlv
                      6.9G   12M  6.6G   1% /mnt
  • Data writes beyond the original file system size fails with error No space left on device

Environment

  • Red Hat Enterprise Linux

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