[rrd-users] Re: Possible problem with daylight savings.
Alex van den Bogaerdt
alex at ergens.op.het.net
Tue Apr 29 10:42:09 MEST 2003
On Mon, Apr 28, 2003 at 03:13:01PM -0400, Jon Nistor wrote:
> Wondering if anyone else has run into this problem or not, I can't seem to
> find any references to it in the archives either.
> The graph in question is attached (graph.gif). Its a monthly output of
> some bw usage for a host. If you notice, the day portions for everything
> after mid-week14 start showing the redline for midnight.
> CDEF:day00=gfh,POP,LTIME,86400,%,0,EQ,INF,UNKN,IF \
> AREA:day00#FF0000:" Midnight / 00\:00 to 00\:05 ( First 300 seconds )\n" \
LTIME is the epoch time corrected for the time zone. The offset from
utc changed and the behaviour changed. That's no coincidence.
> If I'm not mistaken mid-week14 is when the timechange for us was (in
You're graphing something from an RRA with a 2-hour resolution, right?
During normal time the intervals are:
01:00 to 03:00, 03:00 to 05:00 ... 21:00 to 23:00, 23:00 to 01:00
During DST the intervals are:
02:00 to 04:00, 04:00 to 06:00 ... 22:00 to 00:00, 00:00 to 02:00
Et voila, there's your midnight occuring.
Much of what looks like rudeness in hacker circles is not intended to give
offence. Rather, it's the product of the direct, cut-through-the-bullshit
communications style that is natural to people who are more concerned about
solving problems than making others feel warm and fuzzy.
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