[rrd-users] Re: Newbie question on graph alignment

[Alex van den Bogaerdt]

ed.rolison at itc.alstom.com wrote:

> I'm currently plotting a 'per month' graph, of maximum values (over a
> year).
> Whenever I do though the 'transition point' appears to be in the middle of
> the month.
> What I'd like is so the maximum each month, appears as a block from the
> start, to the end of the month.
> At a guess there's a pretty simple way of doing this, but I can't seem to
> figure out what it is.

This is not easy.  RRDtool works with intervals of equal size.  As you
know a month does not have a fixed number of seconds.

Even when you'd decide to show statistics per week you still have a
problem as RRDtool works internally with UTC time.  An interval of
exactly one week will start at fixed intervals.  For the current interval
this is the seventh of February, 00:00 UTC.

1013188654 - (1013188654 mod 604800) = 1013040000 == February 7th 00:00 UTC

I'm not entirely sure but I think you're trying to use the wrong tool
to do your job.

cheers,
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