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# A hash can keep the interesting info for each server.
# For every line of input,
...
    # Add a new partition structure in the current server.
  # If this line has interesting information,
    # Assert it into the current server and/or partition.

$VAR1 = { 'server1' =>
               { 'part1' =>
...
                      { total => 400,
                        free => 100,
                        used => 300 } } };