Hi
I'm puzzled by my results when extracting data from an RRD which stores power usage in kW from several sensors. They are spot values and are not constantly increasing like a router byte counter. This is RRD 1.2 on Windows x86 by the way. The RRD definition is this.... rrdtool create kwh.rrd --start N --step 300 DS:graze_0:GAUGE:900:0:60000 DS:edctr_0:GAUGE:900:0:60000 DS:hall_0:GAUGE:900:0:60000 DS:shop_0:GAUGE:900:0:60000 DS:encounter_0:GAUGE:900:0:60000 RRA:AVERAGE:0.5:1:105120 RRA:AVERAGE:0.5:12:43800 Which as I understand it should maintain the data with two averages for each sensor. One average should be for every 5 minutes for 105120 samples (approx 1 years worth) The other should store 1hrly for 43800 samples (approx 5 years worth) The data collection has been running since approx May 2010 so I was expecting to be able to dump either 5min averages (back to Jun 12ish 2010 - a yrs worth) or the full 1hrly averages right back to May 2010. I realise its averaged data and not actual data values - thats fine. If I dump the data using RRDTOOL DUMP I can see all the data as I expect it. (5 min and 1 hr intervals all ok) The problem I am having is getting the data exported using RRDTOOL XPORT - no matter what step I give it seems to be in 36000 steps and I cant get either 5 min or 1hr steps....... The output command I'm using is (eg) rrdtool xport -s Jan_1 -e Jun_6 --step 300 DEF:graze=kwh.rrd:graze_0:AVERAGE XPORT:graze:graze Which gets me this graze:36000 step: 36000 <?xml version="1.0" encoding="ISO-8859-1"?> <xport> <meta> <start>1293912000</start> <step>36000</step> <end>1307340000</end> <rows>374</rows> <columns>1</columns> <legend> <entry>graze</entry> </legend> </meta> <data> <row><t>1293912000</t><v>NaN</v></row> <row><t>1293948000</t><v>7.6373329643e+003</v></row> <row><t>1293984000</t><v>3.2184306372e+004</v></row> <row><t>1294020000</t><v>8.7615560014e+003</v></row> <row><t>1294056000</t><v>1.9665019537e+004</v></row> <row><t>1294092000</t><v>2.1051444142e+004</v></row> <row><t>1294128000</t><v>7.4891892048e+003</v></row> <row><t>1294164000</t><v>3.1874450422e+004</v></row> <row><t>1294200000</t><v>2.1790117352e+004</v></row> <row><t>1294236000</t><v>3.0731709437e+004</v></row> <row><t>1294272000</t><v>1.6547402220e+004</v></row> <row><t>1294308000</t><v>1.6929343229e+004</v></row> <row><t>1294344000</t><v>2.1757634908e+004</v></row> <row><t>1294380000</t><v>7.4123166718e+003</v></row> <row><t>1294416000</t><v>2.3384609095e+004</v></row> <row><t>1294452000</t><v>8.5652547377e+003</v></row> <row><t>1294488000</t><v>1.6631237788e+004</v></row> <row><t>1294524000</t><v>1.9049472654e+004</v></row> <row><t>1294560000</t><v>8.7360718392e+003</v></row> <row><t>1294596000</t><v>3.1791358773e+004</v></row> Why is the step size so large? I'm sure I'm doing something stupid ..... 8-) Thanks Dave Dave Whitehead | IT & Telecomms Manager | Marwell Wildlife | Colden Common | Winchester | SO21 1JH ( Direct: +44 (0)1962 777930 | Mob: +44 (0)7881 408657 + da...@marwell.org.uk <mailto:da...@marwell.org.uk> : www.marwell.org.uk <http://www.marwell.org.uk/> ----------------------------------------- Please print responsibly Marwell Wildlife is a limited liability company registered in England and Wales under number 1355272. VAT No. 631 9661 30. The company is a registered charity, number 275433 Registered office: Marwell Wildlife, Colden Common, Winchester, Hampshire, SO21 1JH. Opinions expressed in this e-mail are those of the individual, not the company unless specifically indicated to that effect. This e-mail and any attachments are confidential and solely for the use of the intended recipient. If you are not the intended recipient we apologise for any inconvenience. Please return to the sender. Any use or copying is strictly prohibited.
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