[rrd-users] Help understanding rrdtool

Hi,

Im a newbie on rrdtool and Ive been reading the tutorials on the
website, but Im having some trouble to understand it.

I want to make graphs about CPU utilization, lets say:
1 Day - five minute average
1 Week - 30 minute average
1 Month - 2 hour average
1 Year - 1 day average

Data is read every five minutes.

I created a rrd archive and succeeded creating a 1 Day graph with the
following RRA:AVERAGE:0.5:1:288, when I tried to add an RRA for the
weekly graph I messed it up.

Does I need to separete the RRAs in diferent archives, so when I try
to generate the graphs I have only one RRA to get the data from?
otherwise, if I put all the RRAs in only one archive how do I teel the
"rrdtool graph" wich RRA to read?

All the graphs are averages and of type gauge, except the daily graph
that averages only one sample.

Thank you

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