[rrd-users] rrd grap problem

[Alex van den Bogaerdt]

On Fri, Mar 09, 2007 at 12:06:08PM +0100, Kenneth Primstad wrote:

> If I put the followin data for value successful in at 12:00:00 for each
> day:
>  
> day 1: 20
> day 2: 20
> day 3: 20
> day 4: 10
> day 5: 10
> day 6: 10

> When i create a graph showing the data it shows:
>  
> day 1: 20
> day 2: 20
> day 3: 20
> day 4: 15
> day 5: 10
> day 6: 10
>  
> Why is this ? and how can I avoid it ?

http://www.vandenbogaerdt.nl/rrdtool/process.php


How to avoid: if you want one-hour resolution, use one-hour resolution.
You are now using periods of 86400 seconds starting at time 0.  Your
12:00 is not at a whole number times 86400 past time 0.
Your 12:00 _is_ a whole number times 3600 past time 0, not only now but
also in a couple of weeks when daylight saving kicks in.

-- 
Alex van den Bogaerdt
http://www.vandenbogaerdt.nl/rrdtool/