[rrd-users] HELP I dont understand RRA's
linux at thehobsons.co.uk
Tue Jan 26 12:20:08 CET 2010
tony at specialistdevelopment.com wrote:
>So in a last ditch effort to "get" it here is my example with my
>workings, can you guys take a look and see im sort of on the right
>So i want to graph my network traffic. i want to read the data every
>minute so my step is 60 seconds, also wait 120 seconds before unknown.
>RRA 1 - 60 PDP's, so every minute, then create 1 CDP for an hours info.
>RRA 2 - 60 PDP's make 24 CDP's for a days info.
>RRA 3 - 1440 PDP's make 31 CDP's for a months info.
>rrdtool create network.rrd \
> --start N \
> --step 60 \
> DS:bytesIn:DERIVE:120:U:U \
> DS:bytesOut:DERIVE:120:U:U \
> RRA:AVERAGE:0.5:60:60 \
> RRA:AVERAGE:0.5:60:24 \
>Or have i got my numbers totally wrong?
If I understand you correctly, you want to keep one minute samples
for an hour, one hour periods for a day, and 31 periods for a month.
If that is the case, then you've got one error there, your first RRA
should have 1 PDP per CDP.
rrdtool create network.rrd \
--start N \
--step 60 \
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