[rrd-users] Re: RRD setup when collection only daily

Serge Maandag serge.maandag at staff.zeelandnet.nl
Fri Apr 19 12:32:36 MEST 2002


I thought I was one of the few that understood this. 

In this case someone wants to update his archive with one value per day.

Why would you want to have 24 intervals per day?

If he sets his step to 86400 and his ds heartbeat to:
86400 + (a small interval in case he runs late with his daily update)
And he does his first update at midnight, wouldn't that just be what he
His pdp's would be at 00:00 exactly.

I can see why your method works, but wonder what the advantage is.

b.t.w., on the rrdtool site under the heartbeat and the step it says:

``heartbeat'' is not only the maximum acceptable interval between
samples, but also the maximum acceptable amount of ``unknown'' time per
PDP (obviously this is only significant if you have ``heartbeat'' less
than ``step'').

Is this right? I believe that the x-files factor for the ds is the
parameter that determines this.


-----Original Message-----
From: Alex van den Bogaerdt [mailto:alex at ergens.op.HET.NET] 
Sent: Friday, April 19, 2002 11:27 AM
To: Serge Maandag
Cc: RRD users
Subject: Re: [rrd-users] Re: RRD setup when collection only daily

Serge Maandag wrote:
> Oops,
> The problem is, that on days like yesterday, I really like to say: 
> "Let's call it a day" after one hour of work :)


> Don't you mean 86400 and some number bigger than 86400 ?

With a step size of 86400, the interval will begin and end at n*86400.
This means, for Europe, 02:00 local time to 02:00 local time. In the USA
it will be something around 18:00 to 18:00, in Australia it will be
11:00 to 11:00 et cetera.

With a step size of 3600 and updates at 00:00 local time, 24 intervals
will be set with just one update, provided that heartbeat allows it. All
of the intervals between the last update (00:00 yesterday) and the
current one (00:00 today) will be set to the same rate.

 / alex at slot.hollandcasino.nl                  alex at ergens.op.het.net \
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