Library /sys$common/syshlp/sysmanhelp.hlb RESERVED_MEMORY, ADD, 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. The allocated memory is deducted from the system's
    fluid page count, 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 because /ZERO is incompatible with
    /NOALLOCATE. If you specify /NOALLOCATE, or do not specify
    /ALLOCATE, reserved memory is not allocated during the next
    reboot of the system. 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.