[rrd-users] AVERAGE and MAX

vitoannecca at inwind.it vitoannecca at inwind.it
Mon Nov 19 17:07:44 MET 2001

Creating a file.rrd using:
rrdtool create file.rrd --step 5        
            DS:input:COUNTER:600:U:U   \
            DS:output:COUNTER:600:U:U  \
            RRA:AVERAGE:0.5:1:720      \
            RRA:AVERAGE:0.5:5:864      \
            RRA:AVERAGE:0.5:24:900     \
            RRA:MAX:0.5:1:720          \
            RRA:MAX:0.5:5:700          \
            RRA:MAX:0.5:24:900         \
and creating .gif files using:
rrdtool graph fileaverage.gif --start $t0 --end $tf\
            DEF:...=file.rrd:...:AVERAGE \
            DEF:...=file.rrd:...:AVERAGE \
rrdtool graph filemax.gif --start $t0 --end $tf\
            DEF:...=file.rrd:...:MAX \

I'm not sure what I really see on the graph, I mean that if I compare the two graphs I'm not sure the first one is retrieved by averaging values in the second one.
Another problem is this one:
I'd like to know if I misunderstood the maening of RRAs:
I think the average is made over  "1" sample every period of 5 seconds for the last hour,every 25 seconds for the last 5 hour  every 2 minutes for the last day.
I think the max value concerns 1 sample every 5 seconds for the last hour,every 25 seconds for the last 5 hour and so on.
Help me understanding where is my mistake.
Vito Annecca 

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