rrd - rrdtool displays other values as entered -


can explain me why different values when fetch rrd-db filled with.

here commands:

a. create database

rrdtool create temperature.rrd --step 300 -b 1374150100 \  ds:temp:gauge:300:n:n \  rra:average:0:1:5

b. fill data

rrdtool update temperature.rrd \  1374150400:6 \  1374150700:8 \   1374151000:4 \   1374151300:4

c. fetch data

rrdtool fetch temperature.rrd average --start 1374150099 --end 1374151301

output:

                           temp  1374150300: 6.0000000000e+00 1374150600: 7.3333333333e+00 1374150900: 5.3333333333e+00 1374151200: 4.0000000000e+00 1374151500: -nan

i fill database in exact period data. have no idea why displays 7.3 , 5.3?! did missed something?

ok, got it. problem is, start time not fit step interval. can see in output, steps begin ...300, ...600 , on. filled data ...400, ...700 etc. solution set values in correct step interval , works


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