> "A few archive areas are also defined. The first stores the > temperatures supplied for 100 hours (1'200 * 300 seconds = 100 > hours)." > > I am wondering; is this sentence missing the word "average" between > "the" and "temperatures"? > > rrdtool create temperature.rrd --step 300 \ > DS:temp:GAUGE:600:-273:5000 \ > RRA:AVERAGE:0.5:1:1200 \ > RRA:MIN:0.5:12:2400 \ > RRA:MAX:0.5:12:2400 \ > RRA:AVERAGE:0.5:12:2400
No, the manual is correct. This is because the step of the RRD is 300 seconds (5min), which is how often the data comes in. The first RRA is: "RRA:AVERAGE:0.5:1:1200" which means 1200 rows, each holding the average of 1 sample(s). Since the average of a single value is the value itself, this first RRA stores the received values (after time normalisation!) and keeps 1200 of them. 1200 x 300s (the step size) is 100 hours. Then next 3 RRAs store the min, max and average for a set of 12 samples, IE over the period of 1 hour (and keeps 2400 rows, IE 100 days). Steve Steve Shipway ITS Unix Services Design Lead University of Auckland, New Zealand Floor 1, 58 Symonds Street, Auckland Phone: +64 (0)9 3737599 ext 86487 DDI: +64 (0)9 924 6487 Mobile: +64 (0)21 753 189 Email: [email protected] Please consider the environment before printing this e-mail
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