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List:       ntop
Subject:    RE: [Ntop] rrd plugin and data
From:       "Burton Strauss" <Burton () ntopSupport ! com>
Date:       2005-10-14 12:55:49
Message-ID: 079601c5d0be$9beecf90$648ea8c0 () zebra
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Read my reply ... Internally it's a rate, normalized over the interval.

Install rrdtools (the full package) and dump the files - you'll see the raw
#s.

-----Burton 

-----Original Message-----
From: ntop-bounces@unipi.it [mailto:ntop-bounces@unipi.it] On Behalf Of
Stafano Martini
Sent: Thursday, October 13, 2005 9:57 AM
To: ntop@Unipi.IT
Subject: R: [Ntop] rrd plugin and data

Hi,
I have one more question about rrd data.
I have a 100 Mbit/s ethernet. One of the nodes of this network is running
ntop. This node has 2 NICs: one for the remote control and one for the
packet capture.

By using the rrd plugin I want to view how much traffic a node did from x to
y, where x and y are two timestamps, and I guess that value to be reasonably
correct.
If I create the graph for a node N I get a strange situation. The node was
sending at 17 Mbytes/s for 5 min (the interval is 5 min), but this is not
true because that node N was doing almost nothing (I unplugged the eth
cable). I can believe that the node was sending at 17 Mbytes/s for 10
seconds not for 300 seconds. So, the value stored by rrd plugin can't be an
average.

So, What do the values in rrd files represent? I did not find any docs on
that.
Thanks
Stefano


> -----Messaggio originale-----
> Da: ntop-bounces@unipi.it [mailto:ntop-bounces@unipi.it] Per conto di 
> Burton Strauss
> Inviato: venerd́ 7 ottobre 2005 14.58
> A: ntop@Unipi.IT
> Oggetto: RE: [Ntop] rrd plugin and data
> 
> 
> Read the docs on rrd. Everything is stored as a RATE (per second).  So 
> if you are storing at a 5m resolutions, that is a count of around 266.  
> What that is depends on the specific file.  Usually for count-type 
> files it is bytes.
> 
> -----Burton
> 
> -----Original Message-----
> From: ntop-bounces@unipi.it [mailto:ntop-bounces@unipi.it] On Behalf 
> Of Stefano Martini
> Sent: Friday, October 07, 2005 4:04 AM
> To: ntop@Unipi.IT
> Subject: [Ntop] rrd plugin and data
> 
> Hi All,
> I'm using ntop 3.1.50 and activated the rrd plugin to have a view of 
> the traffic stored in rrd files.
> 
> If I fetch data for a specific host IP address I get a strange output 
> saying something like this:
> 
>   Thu Oct 6 16:00:00 2005  1128607200     4.33813
>   Thu Oct 6 16:05:00 2005  1128607500    0.888533
> 
> What are the numbers in the third column? Bytes? Bits? 
> Bytes/sec? Bits/sec? What does 0.888533 mean? Less the 1 bytes of 
> traffic!
> 
> Thanks
> Stefano
> 
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