On Alpha and Integrity servers, adds sections of memory if you
    want to specify more than one resource affinity domain (RAD) for
    a single reservation.

    EXTEND does not allow you to specify any of the /ALLOCATE, /ZERO,
    or /PAGE_TABLES flags. The existing reservation determines the
    state of these flags. The /ALLOCATE flag is set implicitly with
    EXTEND, whether or not it was set for the initial reservation.

    To add a memory section without specifying a RAD, use the /NORAD
    qualifier.

    Format

      RESERVED_MEMORY EXTEND  name