VMS Help SET, FILE, /AI_JOURNAL  *Conan The Librarian (sorry for the slow response - running on an old VAX)

    The SET FILE/AI_JOURNAL command marks one or more RMS files
    for after-image journaling. You can also specify certain
    characteristics of the journal with this command, including its
    file specification, whether it is to be created, its initial
    size, and its default extension quantity. The SET FILE/NOAI_
    JOURNAL command unmarks a file for after-image journaling.

    The SET FILE command is not supported for remote files. You
    must use the SET FILE command from the system where the file
    is located.

    Format

      SET FILE/[NO]AI_JOURNAL=(FILE=journal-filespec[,...])

                             data-filespec[,...]

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