Biased graph - shifted average periods
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Biased graph - shifted average periods
by Igor I. Shulz
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Help pls
My brain is boiling out. I've created rrd-file to accumulate data on a per-hour-basis (--step 3600). Thre are two AVERAGE sets: RRA:AVERAGE:0.5:4:62 RRA:AVERAGE:0.5:24:45 --start set on the edge of a day - 1242248400 But 4-hour averages are not set on even 4-hour ranges (00:00, 04:00, 08:00 etc), but are set on ranges 03:00, 07:00, 11:00. This is part of dump of my rrd-file: <cf> AVERAGE </cf> <pdp_per_row> 4 </pdp_per_row> <!-- 14400 seconds --> <xff> 5.0000000000e-01 </xff> ... <database> <!-- 2009-05-03 19:00:00 EEST / 1241366400 --> <row><v> NaN ......... <!-- 2009-05-03 23:00:00 EEST / 1241380800 --> <row><v> NaN ......... <!-- 2009-05-04 03:00:00 EEST / 1241395200 --> <row><v> NaN ......... <!-- 2009-05-04 07:00:00 EEST / 1241409600 --> <row><v> NaN ......... Daily average (by 24 points) is also shifted - periods are not 00:00-23:59, but 03:00-02:59: <cf> AVERAGE </cf> <pdp_per_row> 24 </pdp_per_row> <!-- 86400 seconds --> <xff> 5.0000000000e-01 </xff> ............ <database> <!-- 2009-03-30 03:00:00 EEST / 1238371200 --> <row><v> NaN .... <!-- 2009-03-31 03:00:00 EEST / 1238457600 --> <row><v> NaN .... <!-- 2009-04-01 03:00:00 EEST / 1238544000 --> <row><v> NaN .... As result I have ugly shifted line on a graphs. Is it possible to set average periods on the more reasonable points? 00:00, 04:00 ... for 4-hour average and 00:00, 00:00 ... for daily average _______________________________________________ rrd-users mailing list rrd-users@... https://lists.oetiker.ch/cgi-bin/listinfo/rrd-users |
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Re: Biased graph - shifted average periods
by Simon Hobson-2
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Igor I. Shulz wrote:
>I've created rrd-file to accumulate data on a per-hour-basis (--step >3600). Thre are two AVERAGE sets: >RRA:AVERAGE:0.5:4:62 >RRA:AVERAGE:0.5:24:45 > >--start set on the edge of a day - 1242248400 > >But 4-hour averages are not set on even 4-hour ranges (00:00, 04:00, >08:00 etc), but are set on ranges 03:00, 07:00, 11:00. ... >Is it possible to set average periods on the more reasonable points? >00:00, 04:00 ... for 4-hour average >and >00:00, 00:00 ... for daily average What is the local timezone on the server ? I'm guessing that since your email says +4, your server might be set to +3 and this would account for your problem. RRD uses UTC, and all steps are aligned on Unix epoch (ie "start of time" at midnight 1st Jan 1970). Hourly/daily etc steps will always be aligned on midnight UTC. It's been discussed regularly in the past, but I can't recall what teh answer was. -- Simon Hobson Visit http://www.magpiesnestpublishing.co.uk/ for books by acclaimed author Gladys Hobson. Novels - poetry - short stories - ideal as Christmas stocking fillers. Some available as e-books. _______________________________________________ rrd-users mailing list rrd-users@... https://lists.oetiker.ch/cgi-bin/listinfo/rrd-users |
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