[mrtg] Re: 4th and 5th columns in MRTG logfile

[Shahira Rasmy]

Hi All,
I want to apologize if the punctuation marks were misunderstood.
I didn't mean being impolite,i was just expressing my wondering about the
MRTG log behaviour.
Thanks for your advice James.
And Have All A nice day
Shahira
----- Original Message -----
From: James Overbeck <grendel at gmo.jp>
To: <mrtg at list.ee.ethz.ch>
Sent: Monday, February 17, 2003 10:28 AM
Subject: [mrtg] Re: 4th and 5th columns in MRTG logfile


>
> Hello Shahira,
> Please try easing off on the punctuation marks. People will consider you
> more polite, and helpful responses will be more numerous.
> As an example, I'll give you the first five lines from a random MRTG log
> file at my company.
>
> 1045468925 2732540222 3943054909
> 1045468925 94785 118521 94785 118521
> 1045468623 146518 156904 146518 156904
> 1045468500 127347 165933 146518 178574
> 1045468200 99205 150287 100508 178574
>
> Look at the first column in each row. That is the number of seconds that
> have passed since January 1, 1970, Greenwich Mean Time. Notice that the
> fourth and fifth timestamps end in double zeros while the first three end
in
> comparatively random numbers. If you are on some sort of Unix system you
can
> transform them into legible times like this:
>
> $ perl -e 'print(localtime(1045468925)."\n")'
> Mon Feb 17 17:02:05 2003
>
> $ perl -e 'print(localtime(1045468200)."\n")'
> Mon Feb 17 16:55:00 2003
>
> If you look on down the timestamps in any MRTG log file and look at the
> legible times like this, you'll notice that the minutes are always
divisible
> by five except for the first three lines' timestamps. The crontab that
> generated this log file runs every five minutes at 16:57, 17:02, 17:07,
and
> so on. MRTG takes a few seconds to run before it actually touches the log
> file. For the first few timestamps it maintains the same five minute
> intervals as whatever crontab that affected the log file. From the fourth
> line onward MRTG shifts this interval such that the minutes of the
timestamp
> are divisible by five, and begins to calculate the new average and maximum
> for each displaced interval. If my crontab were set to run every five
> minutes on the five-minute, and if my config file were very short and very
> fast, then average and max for the first day would be identical.
> I'm guessing that displacing the interval like this makes calculations
easier.
>
> Best regards,
> James
>
>
> Shahira Rasmy wrote:
> > Deal All,
> > I need an urgent help in this.I still can't understand the values in the
4th and 5th columns in MRTG log file.
> > I know they represent the maximum in a given period,but i can't
understand what is this period in case of daily section??????
> > I  thought that the 2nd & 4th,and, the 3rd & 5th columns will be
identical as the reading is taken every 5 minutes so the max in this period
will be the value itself.But i found the values to be different!!!!!!
> >
> > Can anyone help me to understand how the mrtg thinks??????????????
> >
> > Thanks,
> > Shahira
>
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