rrdtool create freeports.rrd --step 86400 DS:eth:GAUGE:172800:0:U
RRA:AVERAGE:0.5:1:30 RRA:AVERAGE:0.5:7:4 RRA:AVERAGE:0.5:30:6

So, your step is 1 day, then you have three RRAs, daily (month long), weekly 
(month long) and monthly(ish)(6mo long).

When you do a FETCH, make sure to specify the  first RRA, and to have the 
bounds correctly to include the number of lines you want to fetch.  Also, if 
you're not located in the UK, you might find the timezone causing problems as 
the step boundary is measured in UCT and so will tick over at midnight GMT.

Steve

Steve Shipway
University of Auckland ITS
UNIX Systems Design Lead
s.ship...@auckland.ac.nz
Ph: +64 9 373 7599 ext 86487


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