RRDTool Data Normalisation. RRDTool interpolates the data to fit into the predefined time ‘buckets’. You cannot store the data with the exact time you enter them (well, unless you do some very weird things using a 1second step and large heartbeat but that causes other problems) unless you ensure each data point is logged exactly on a time window boundary.
See Alex’s excellent tutorial: http://www.vandenbogaerdt.nl/rrdtool/process.php 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: [email protected] [mailto:[email protected]] On Behalf Of Chris Nighswonger Sent: Friday, 9 November 2012 3:26 p.m. To: [email protected] Subject: [rrd-users] Question about time stamp, etc with GAUGE DST What is it that I do not understand about the timestamps in the following RRD? Just below it is the actual data as inserted into the RRD via RRDs::update. Below that is the fetch of what the same data looks like in the RRD. My question is why is the data from time 1352425184 split across two steps? I'm guessing it has to do with the difference between the --start value and when the logging daemon is started. What I am trying to achieve is the data point recorded in a single step. Is this possible? Kind Regards, Chris RRD: rrdtool create sperrors.rrd --start now --step 60 \ DS:align-err:GAUGE:120:0:100000 \ RRA:AVERAGE:0.5:1:10080 \ RRA:MAX:0.5:1:10080 \ RRA:LAST:0.5:1:1 \ RRA:AVERAGE:0.5:60:1440 \ RRA:MAX:0.5:60:1440 \ RRA:AVERAGE:0.5:720:732 \ RRA:MAX:0.5:720:732 Data being inserted into RRD: 1352424941:0 1352425001:0 1352425061:0 1352425121:0 1352425184:2 1352425244:0 1352425304:0 1352425364:0 Output of "$rrdtool fetch sperrors.rrd AVERAGE --start 1352424941" align-err 1352424960: 0.0000000000e+00 1352425020: 0.0000000000e+00 1352425080: 0.0000000000e+00 1352425140: 6.3333333333e-01 1352425200: 1.4666666667e+00 1352425260: 0.0000000000e+00 1352425320: 0.0000000000e+00 1352425380: 0.0000000000e+00 1352425440: 0.0000000000e+00 1352425500: 0.0000000000e+00 1352425560: 0.0000000000e+00
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