/DEMAND_MERGE DSAn:

    Note: Do not include any HBMM-specific qualifiers in a command
    with this qualifier; doing so causes the command to fail.

    Initiates a merge operation on the specified shadow set.
    This qualifier is useful if the shadow set was created with
    the INITIALIZE/SHADOW command without the use of the /ERASE
    qualifier. For more information about using /DEMAND_MERGE, see
    the VSI Volume Shadowing for OpenVMS manual.

    You cannot specify /ALL with /DEMAND_MERGE.

    An OPCOM message is displayed for each shadow set indicating
    that a demand merge has been invoked and recording the process ID
    (PID) of the process that executed the command. For example:

    %%%%%%%%%%%  OPCOM   9-MAR-2004 10:35:23.24  %%%%%%%%%%%
    Message from user SYSTEM on NODE1
    Demand Merge requested for _DSA721:, PID: 2760009A