The GENFILES phase generates the new page, swap, and dump
    files on the system. This phase changes the file sizes based
    on AUTOGEN's calculations.

    The GENFILES phase does not modify a file if the calculated
    size change is within ten percent of the existing file size.
    The following files are affected: PAGEFILE.SYS, SWAPFILE.SYS,
    SYSDUMP.DMP, and all other currently installed page and swap
    files. For more information, refer to the chapter on managing
    page, swap and dump files in the VSI OpenVMS System Manager's Manual.

    GENFILES is valid only as an end phase. GENFILES requires the
    SYSPRV privilege.