[rrd-users] Re: french resources about RRD?

[Alex van den Bogaerdt]

Alex wrote:

> I am trying to monitor number of new people entering in a room. Each 5 minutes, I would like to graph only the number of new people. I did several test with all type of DS but I didn't succeed.

You mean the following?

T+0:   10 people
T+300: 16 people
T+600: 10 people

you want to display 6 and -6 ?

If so:  calculate the rate per second in a DERIVE counter.  Multiply
the rate by the number of seconds (this can be in a CDEF).

The database will contain (6/300=) 0.02 for the first interval
and -0.02 for the second interval.  When multiplied by 300 you end up
with (0.02*300=) 6 and (-0.02*300=) -6.

cheers,
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