Library /sys$common/syshlp/sysmanhelp.hlb RESERVED_MEMORY, MODIFY, Qualifiers, /ALLOCATE  *Conan The Librarian (sorry for the slow response - running on an old VAX)

       /ALLOCATE
       /NOALLOCATE (default)

    Allocates contiguous, aligned pages during the next reboot of the
    system as specified on the command line. (The default is taken
    from the existing Reserved Memory Registry entry.) The allocated
    memory is deducted from the system's fluid pagecount, and the
    creation of the memory-resident global section results in the use
    of the allocate option. The physical alignment of the pages is
    based on the maximum granularity hint factor that can be used to
    map the pages depending on the size of the reserved memory.

    Possible granularity hint factors are 512 pages (or 4 MB) and 64
    pages (or 512 KB). Therefore, assuming an 8-KB system page size,
    reserved memory is physically aligned as follows:

    o  size >= 4 MB: physically aligned on a 4-MB boundary

    o  size < 4 MB: physically aligned on a 512-KB boundary

    /NOALLOCATE implies /NOZERO. (/ZERO is incompatible with
    /NOALLOCATE.) If you specify /NOALLOCATE, or do not specify
    /ALLOCATE, the reserved memory is not allocated during the next
    reboot of the system. The reserved memory is deducted only from
    the system's fluid page count, and the creation of the memory-
    resident global section results in the use of the fault option.