[rrd-users] Displaying Combined Sources with VDEFs

[MrPaul]

I'm trying to merge data from multiple rrd files (CDEF seems logical
for this).  Then with that merged data use VDEF to diplay the maximum,
min, and other generic output of the merged data.

Would someone mind looking over this below and tell me what I'm doing
wrong as I'm just too dense to get it :).  The error I'm getting is
"ERROR: unknown function 'VDEF'".

/usr/bin/rrdtool graph speed.gif \
        --start end-1w --end 00:00 \
        --vertical-label modems \
        DEF:ds0a=modem_stats/ras.vp.rrd:ds0:AVERAGE \
        DEF:ds0b=modem_stats/ras2.vp.rrd:ds0:AVERAGE \
        DEF:ds1a=modem_stats/ras.vp.rrd:ds1:AVERAGE \
        DEF:ds1b=modem_stats/ras2.vp.rrd:ds1:AVERAGE \
        CDEF:ds0total=ds0a,ds0b,+ \
        CDEF:ds1total=ds1a,ds1b,+ \
        LINE1:ds0total#0000FF \
        LINE1:ds1total#00CCFF \
        VDEF:ds0max=ds0total,MAXIMUM \
        VDEF:ds0avg=ds0total,AVERAGE \
        VDEF:ds0min=ds0total,MINIMUM \
        VDEF:ds0pct=ds0total,95,PERCENT \
        VDEF:ds1max=ds1total,MAXIMUM \
        VDEF:ds1avg=ds1total,AVERAGE \
        VDEF:ds1min=ds1total,MINIMUM \
        VDEF:ds1pct=ds1total,95,PERCENT \
        CDEF:ds0bits=ds0total,8,* \
        CDEF:ds1bits=ds1total,8,* \
        COMMENT:"          " \
        COMMENT:"Maximum    " \
        COMMENT:"Average    " \
        COMMENT:"Minimum    " \
        COMMENT:"95th percentile\n" \
        AREA:ds0bits#00C000:"Inbound " \
        GPRINT:ds0max:"%6.2lf %Sbps" \
        GPRINT:ds0avg:"%6.2lf %Sbps" \
        GPRINT:ds0min:"%6.2lf %Sbps" \
        GPRINT:ds0pct:"%6.2lf %Sbps\n" \
        LINE1:ds1bits#0000FF:"Outbound" \
        GPRINT:ds1max:"%6.2lf %Sbps" \
        GPRINT:ds1avg:"%6.2lf %Sbps" \
        GPRINT:ds1min:"%6.2lf %Sbps" \
        GPRINT:ds1pct:"%6.2lf %Sbps\n"

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