[rrd-users] graphing different time periods & RRA usage

Jesse Driskill jessed at 180solutions.com
Mon Apr 26 05:04:02 MEST 2004

Hello all,
    I've read majority of the tutorials and the manpages. My question doesn' appear to be answered in them, but perhaps I'm misunderstanding something a little basic here. 
I've created the forllowing DB: 
rrdtool create f502_cur_conns.rrd -s 30 \
DS:f502curconns:GAUGE:120:0:U \
RRA:AVERAGE:0.1:1:60 \
RRA:AVERAGE:0.2:2:60 \
RRA:AVERAGE:0.5:20:8640 \
RRA:AVERAGE:0.5:7200:7 \
My goeal is to recodr th following averages: (I may back these off in the future, but for now this provides the granularity I think I need). 
# every 30 seconds per 30 minutes
# 1 minute average per hour
# 10 minute average per day
# 1 hour average per week
# 12 hour average per previous 30 days
   My question is, how does rrd know which value to use when generating the graphs? If I view a one week graph, say last week, does it automatically use the correct PDP's or do I have to tell it to use the correct ones? Or what if I generate a graph that is nine days vs a nice clean amount... how does it handle thi mix of datapoints? 
   If this is answered in a map page or tutorial, please just point me to it & I'll find the answers, otherwise I appreciate any help you could provide.

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