/sys$common/syshlp/DFUHLP.HLB  —  INDEXF  Qualifiers  /SHADOW_MEMBER
    /SHADOW_MEMBER=device:

    The physical member of the shadowset on which to perform an
    EXTEND or DEFRAG operation. This qualifier is only required
    in combination with /DEFRAG and /EXTEND. Example : DFU>
    INDEXF/DEFRAG DSA0:/SHADOW_MEMBER=$1$DUA104:
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