/CACHE=(option[,...])

    Enables or disables XFC caching for the volume. If CLEAR_DATA
    option is specified, then contents of the volume already in cache
    are cleared. (If you do not specify the /CACHE qualifier, XFC
    caching attributes of the volume as well as the contents of
    the volume already in cache are not affected.) Keywords are as
    follows:

    Keyword     Description

    DATA        Enables XFC caching for the volume.
    [NO]DATA    Disables XFC caching for the volume.
    CLEAR_DATA  Clears contents of the volume present in the XFC
                cache (if any).