The /ALL qualifier to the WRITE command indicates that the output
  file should contain a display consisting of all classes and all fields.

  The use of the /ALL qualifier to produce an output file or hardcopy is
  recommended when reporting a cluster related problem to VSI.

  Note:  One display update occurs prior to the output of the file when
         the /ALL qualifier is specified. This is required because
         SHOW CLUSTER cannot currently have the information necessary to
         display all the possible fields. This means that the output file
         can differ from the display currently on the terminal's screen.