[rrd-users] Re: Getting number of bytes transfered from an existing RRD?

Mats Pettersson mog.pettersson at telia.com
Sat Jun 7 12:32:20 MEST 2003

Hi again!

I just read this from the RRD tool create manual:

"RRDtool plots continuous data, and as such is not appropriate for plotting
absolute volumes as for example ``total bytes'' sent and received in a

So i guess i find some other solution. If anybody has a tip or so about
other tools he/she's welcome to drop me a mail off list.


----- Original Message ----- 
From: "Mats Pettersson" <mog.pettersson at telia.com>
To: "RRD Users" <rrd-users at list.ee.ethz.ch>
Sent: Saturday, June 07, 2003 2:30 AM
Subject: [rrd-users] Getting number of bytes transfered from an existing

> Hi!
> I already have a RRD with counters with two DS measuring avarage in/out
> traffic on a network interface (ala mrtg) which work's well. Now i would
> like to sum up how much data (in bytes) that flow through in and out on
> interface each week. Can i use the existing RRD database or do i have to
> make a new one? Or maybe it's something for the frontend to keep track of?
> What i can't figure out is how to get the difference between "now"
> minus -start -168h for example, with the RRD i'm now using. The RRD looks
> like follows:
> RRDs::create ($rrd_data,
> "--start",$start_time,
> "--step",$samplerate,
> "DS:bin:COUNTER:$heartbeat:U:U",
> "DS:bout:COUNTER:$heartbeat:U:U",
> "RRA:AVERAGE:0.5:1:288", # 5 minute samples (one day)
> "RRA:AVERAGE:0.5:12:168");      # 1 hour samples (one week)
> bin=total number of bytes in, bout = total number of bytes out, which is
> updated every 5 minutes. So by subtracting the total number of bytes a
> ago from the total number of bytes now, i get the number of bytes passed
> a week, right?
> I was thinking of using fetch to fetch one value at "now" and one value
> at -start -168h and then manually subtracting them, but that doesn't seem
> like the right thing to do.
> Am i totaly out of track here? Should i pick up stamp collection instead?
> Mats

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