[rrd-users] step period, start and end

Justin Carroll justcarroll at gmail.com
Wed Sep 22 15:40:17 CEST 2010

Thanks for the information.

It does make sense that everything would be related to UTC.  I don't really
want to fudge the time zone info here and you mentioned "If you want a
period other than that you will need to keep a more detailed set of data and
do things slightly differently."  Please explain.

Also, if a data source is GAUGE then "These are "real" values so they should
match what we put in" the rrd.  If the source of data is an accumulation ie.
total number of cars past a certain point with respect to time, then the
data will reflect just that.  In this particular case I am not measuring

I hope this clears up my use.


On Wed, Sep 22, 2010 at 12:49 AM, Simon Hobson <linux at thehobsons.co.uk>wrote:

> Justin Carroll wrote:
> >I am using GAUGE because I am looking for total water accumulation.
> RRD Tool **ONLY** stores rates. You can calculate total from the rate
> very easily.
> >My goal is to create a graph that only shows the MAX accumulation
> >for the day.  I was almost able to do this by setting a step time to
> >1day.  The problem is that the "step" doesn't go from midnight to
> >midnight.  In my case it goes from 6pm to 6pm the next day.
> RRD Tool references everything to Unix Epoch - ie Midnight 1st Jan
> 1970 UTC. If you have a 24 hour consolidation then it will ALWAYS
> start and end at midnight UTC. If you want a period other than that,
> you will need to keep a more detailed set of data and do things
> slightly differently.
> Alternatively, you could fudge it by setting the timezone to UTC
> before doing each update and before doing each extraction. Ie, make
> RRD Tool think that the times you are feeding it are UTC rather than
> your real local timezone.
> --
> 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.
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