VMS Help V73 Features, System Management Features, Volume Shadowing for OpenVMS  *Conan The Librarian (sorry for the slow response - running on an old VAX)

    Volume Shadowing for OpenVMS introduces three new features, the
    minicopy operation enabled by write bitmaps, new qualifiers for
    disaster tolerant support for OpenVMS Cluster systems, and a new
    /SHADOW qualifier to the INITIALIZE command. These features are
    described in this section.

  Additional Information (explode) :

• Minicopy in Compaq Volume Shadowing (Alpha)
• Multiple-Site OpenVMS Cluster Systems
• Using INITIALIZE With SHADOW and ERASE Qualifiers