GBLPAGFIL defines the maximum number of systemwide pages allowed
    for global page-file sections (scratch global sections that can
    be used without being mapped to a file). These global page-
    file sections can be temporary, permanent, system, or group,
    and are allocated from the page file specified in the system
    process header at bootstrap time. When you allow pages for
    global page-file sections, you must increase the size of the
    page file accordingly. Users with CMKRNL privilege can change
    this parameter value on a running system.

    Global page-file sections are created with the Create and Map
    Section system services ($CREATE_GPFILE, $CRMPSC, and $CRMPSC_
    GPFILE_64) without an explicit disk file. These sections are used
    for the RMS global buffers required for shared files. Users of
    shared files should note that global page-file sections cause
    both the global page table and the default system page file
    (PAGEFILE.SYS) to be used. If the value of GBLPAGFIL is too
    small, $CRMPSC issues an error message when you attempt to create
    global page-file sections.

    You must have scratch global sections if you use RMS global
    buffers. Each file using global buffers requires, in the system
    page file, the file's bucket size multiplied by the number of
    global buffers for that file. If the file's bucket size varies,
    as with RMS indexed files, use the maximum bucket size. For
    shared sequential files, use the multiblock count of the first
    stream to perform the $CONNECT service in place of the file's
    bucket size.

    The default value for this parameter is adequate for most
    systems. However, if your site uses RMS global buffering to a
    significant extent, you may need to raise the value of GBLPAGFIL.
    Use the /GLOBAL qualifier of the Install utility to examine
    the number of pages consumed by RMS global buffers. The global
    sections used by RMS for global buffers have the prefix RMS$
    followed by 8 hexadecimal digits.

    Global buffers are enabled with the DCL command SET
    FILE/GLOBAL_BUFFERS, which is described in the VSI OpenVMS DCL
    Dictionary.

    GBLPAGFIL is an AUTOGEN-altered and a DYNAMIC parameter.