You are not entering enough values to get a complete cdp.
This is important: --start 1325232008 --step 180 \ . RRA:AVERAGE:0.5:20:10000 What this says is the STEP of the RRD is 180 seconds, or 3 minutes (often, people will use 1min or 5min). You are only STORING the data in a single RRA, which has 10,000 cdp lines, where each cdp (consolidated data point) is the AVERAGE of 20 dps (data points). So, you need to write 20 data points, at 3min intervals, before you get ONE cdp stored. Your xff is 0.5 which means that a cdp will remain unknown until at least 50% (IE, 10) points are written. This means you will get NaN output from your fetch until you have done at least 30 mins of data! Your test data had only 2 data points, and they are only 21 seconds apart, so the second would be ignored anyway. Try entering in at least 10 dps, with time intervals of 180, and you should start seeing a single cdp on your fetch. I suspect you are not setting the step or RRA parameters appropriately. Maybe try an additional RRA with AVERAGE:0.5:1:10000 (so each data point is stored), and/or decrease the step? 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: <mailto:[email protected]> [email protected] P Please consider the environment before printing this e-mail From: v g [mailto:[email protected]] Sent: Friday, 20 January 2012 6:56 a.m. To: Steve Shipway Cc: [email protected] Subject: Re: [rrd-users] Help with RRD.... in over my head Hi Thanks for your reply. Still having an issue but managed to isolate it further. It looks like it enters the first update correctly and then fails on the subsequent ones. Obviously, I am not doing something correct but I cant figure out what. Here is what I did as per your suggestion: Creating RRD file: rdtool create birken-boiler.rrd \ --start 1325232008 --step 180 \ DS:boiler_out_flow:GAUGE:600:0:U \ DS:boiler_in_flow:GAUGE:600:0:U \ DS:vihara_in_flow:GAUGE:600:0:U \ DS:vihara_out_flow:GAUGE:600:0:U \ DS:outbldg_in_flow:GAUGE:600:0:U \ DS:outbldg_out_flow:GAUGE:600:0:U \ DS:cistern_top:GAUGE:600:0:U \ DS:cistern_bottom:GAUGE:600:0:U \ DS:boiler_flow_gpm:GAUGE:600:0:U \ DS:vihara_flow_gpm:GAUGE:600:0:U \ DS:outbldg_flow:GAUGE:600:0:U \ DS:boiler_btu_per_hr:GAUGE:600:0:U \ DS:vihara_btu_per_hr:GAUGE:600:0:U \ DS:outbldg_btu_per_hr:GAUGE:600:0:U \ RRA:AVERAGE:0.5:20:10000 Entering in Values: rrdtool updatev birken-boiler.rrd 1325404770:102.7:137.1:140.0:122.6:126.8:122.2:258.7:138.4:0.0:5.0:0.0:0:434 82:0 rrdtool updatev birken-boiler.rrd 1325404791:102.6:137.2:140.2:121.9:126.7:122.1:260.2:145.2:0.0:5.0:0.0:0:455 86:0 Output: return_value = 0 [1325235600]RRA[AVERAGE][20]DS[boiler_out_flow] = NaN [1325235600]RRA[AVERAGE][20]DS[boiler_in_flow] = NaN [1325235600]RRA[AVERAGE][20]DS[vihara_in_flow] = NaN
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