/ROOT=directory-specification
       /NOROOT

    Supplies the directory specification to be associated with the
    file name. For cluster satellite service, the /ROOT qualifier
    specifies the satellite root directory. For noncluster service,
    this qualifier specifies the location of the file. If the file
    specification or the file name given in the boot request includes
    the directory name, this qualifier is ignored. The directory
    specification is limited to 127 characters.

    If you do not specify the /ROOT qualifier, the setting remains
    unchanged. The /NOROOT qualifier clears the field.