> o It would be nice to call a function that returns only the MAX or AVERAGE
> (whichever is specified) _overall value_ for some specified time range (be
> it -5min, -10h or -1m). Of course it would be nice to have this in RRDs..
> The motivation for this would be that I won't have to sum or compare the
> output lists, or even care about values that weren't specified in some
> sampling periods. And doing sums/comparisons on a lower level would be
> significantly faster.
> 

rrdtool graph /dev/zero \
    --start "any date/time you like" \
    --end "any other date/time thereafter" \
    DEF:val1=$RRD:$DS1:AVERAGE \
    DEF:val2=$RRD:$DS2:AVERAGE \
    PRINT:val1:MAX:"%6.2lf bps" \
    PRINT:val1:MIN:"%6.2lf bps" \
    PRINT:val1:AVERAGE:"%6.2lf bps" \
    PRINT:val2:MAX:"%6.2lf bps" \
    PRINT:val2:MIN:"%6.2lf bps" \
    PRINT:val2:AVERAGE:"%6.2lf bps"

modify to suit your needs

Regards,
Alex

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