File Mode Number 6
SFS treats this file mode number the same as file mode number 1.
Note: If you want your files to have the INPLACE attribute
(update-in-place), which means that the existing
records of a file are written back to their previous location on the
file pool rather than in a new slot, you can create or change the
extended file attributes for those files. For more information on
manipulating extended file attributes, see z/VM: CMS Application Development Guide.