/RAD=n

    Specifies the preferred resource affinity domain (RAD) for the
    reservation you want to make. The value of n is the number of
    the RAD you specify. If you omit this qualifier, or if this RAD
    does not have sufficient memory, any other RAD can satisfy the
    reservation request, and the first available memory section will
    be used.

    The /ALLOCATE qualifier is enforced implicitly when you specify a
    RAD.