[rrd-users] Re: DST beginner question

Alex van den Bogaerdt alex at ergens.op.het.net
Tue Nov 7 19:45:05 MET 2006

On Tue, Nov 07, 2006 at 07:14:18PM +0100, Christoph Schwabl wrote:

> 1. file 07.11.2006,15:46:32,7542433,Ingress Cells (ATM)
> 2. file: 07.11.2006,16:02:02,6517020,Ingress Cells (ATM)
> 3: file: 07.11.2006,16:16:47,6258907,Ingress Cells (ATM)
> 4: file: 07.11.2006,16:31:49,11748027,Ingress Cells (ATM)
> 5: file: 07.11.2006,16:46:49,14060652,Ingress Cells (ATM)
> 6: file: 07.11.2006,17:01:56,13571731,Ingress Cells (ATM)
> ... (I get all 15 minutes a new file.)
> That means:
> The system has collected between 15:46:32 and 16:02:02 exactly 6517020 
> ingress atm cells.
> Between 16:02:02 and 16:16:47 exactly 6258907 ingress atm cells.
> and so on.

So, in roughly 15 minutes, the amount of cells is received.
In other words, this is like a counter that's reset every
time it is read --> ABSOLUTE.  You don't have to reset this
counter, the device seems to do this for you.

The result is 6517020 ingress atm cells in (16:02:02 - 15:46:32),
which is 15 minutes 30 seconds --> 7007.5 cells per second. This
is the computed rate, before normalization occurs.

> >> I want to build a graph in bits/s.

Once you have the proper rate of cells per second, it is easy,
using CDEF, to multiply by <bytes per cell> and by <bits per byte>.

Can you manage from here?

Alex van den Bogaerdt

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