[rrd-users] Re: difference between daily, weekly and yearly graphs

[Alex van den Bogaerdt]

JKnash at bnyclearing.com wrote:

> I've been polling some gigabit switch interfaces and stuffing the data into
> an rrd database for a couple of days now.  Unfortunately I'm seeing some
> differences between graphs for day, week, and year.  I.E. the daily graph
> shows my interface pushing 40 mbits of data yesterday, but the max on my
> weekly graph only comes up to 34 mbits.  I setup these graphs from the
> tutorial and changed the following -

Averages.

t1: 40 mbps
t2: 20 mbps
t3: 25 mbps
t4: 15 mbps

Consolidation occurs; consolidating two values into one:

tt1: 30 mbps
tt2: 20 mbps

Now check max(t1 t2 t3 t4) and max(tt1 tt2)

Using the RRAs with CF MAX:

t1: 40 mbps
t2: 20 mbps
t3: 25 mbps
t4: 15 mbps

Consolidation occurs; consolidating two values into one:

tt1: 40 mbps
tt2: 25 mbps

Now check max(t1 t2 t3 t4) and max(tt1 tt2) again.

If you want rates, you're doing fine.  If you want maximum values,
you need to process maximum values.

This subject has come up either on this list or the mrtg list,
I suggest a google session.

cheers,
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