Hi Adam
Yeah, I took a quick look and can see exactly
what you mean.
I have done just that for the moment, at
least we can get the details we need quickly and easily that way. - Also
I am discussing attempting to get refunds for the incorrectly calculated
traffic as well, as the more I read into this -- the more you guys are
right - it really is unfair.
Thanks again for your help in getting to
the bottom of this!
Colin
From:
"Adam Armstrong"
<adama@memetic.org>
To:
"Observium Network
Observation System" <observium@observium.org>
Date:
22/10/2014 16:42
Subject:
Re: [Observium]
95th percentile and billing module - possible discrepancies
Sent by:
"observium"
<observium-bounces@observium.org>
Calculating this would require some major
changes, and I'm not convinced it's actually something useful to calculate.
As a workaround you can just put each port
as a separate bill and add them together.
What your provider is doing is very dishonest.
The whole purpose of the multiple-port billing system is for circumstances
such as these, where you buy a multiple redundant ports for the same service.
You should obviously be billed on the 95th of the aggregated traffic, not
on multiple separate 95th calculations added together.
If I were you, I'd change provider.
adam.
------ Original Message ------
From: colin.barker@bluesky.co.uk
To: "Observium Network Observation
System" <observium@observium.org>
Sent: 10/22/2014 4:49:53 AM
Subject: Re: [Observium] 95th percentile
and billing module - possible discrepancies
Hi Tom
Thanks for getting back to me (and sorry for my slow response!). It is
exactly as you say and after chatting with them in more detail cleared
up a lot of how they make their calculations. They use RTG and its 95.pl
perl script to get the values out -- which adds the two up separately as
unrelated links. So it just comes down to two different methods of calculation.
I would like to ask if it were possible to have Observium calculate both
the fair way or the unfair way, but I can understand why this may get skipped
over (because.. it is unfair!). Tempted to have a look at the calculation
code to see if I could help out in anyway by seeing how hard it would be
to add it in myself and pass back for everyone to look at?
Thanks again for the info!
Regards
Colin Barker
From: Tom
Laermans <tom.laermans@powersource.cx>
To: Observium
Network Observation System <observium@observium.org>
Date: 15/10/2014
15:30
Subject: Re:
[Observium] 95th percentile and billing module - possible
discrepancies
Sent by: "observium"
<observium-bounces@observium.org>
Hi Colin,
As far as I understand it, if you have 2 ports in a 95% bill, the traffic
data will be added together, then 95% is calculated. This is pretty reasonable
seeing as that is the data you have actually used and bursted during that
time, in total.
If you look at both ports separately, they go higher because you just add
up 2 95% numbers that are actually "unrelated", you get 80.
In short, your bill is not fair, but I believe many providers will count
it like that... (one of my upstreams does this too)
Tom
On 10/15/2014 04:22 PM, colin.barker@bluesky.co.uk
wrote:
Hi
I thought I would post here first, just in case what I am seeing isn't
a bug, and just me just mis-understanding the calculations.
Just a quick setup - we currently are billed on a 95th percentile from
an ISP, which we have two physical ethernet connections plugged into two
different HP ProCurve switches. I have created a Bill under Traffic Accounting,
and set the billing type as 95th @ 50 Mbps, and added both the ports for
our connections so I am able to see both under "Bill Ports".
This has been running for about 6 - 7 months now, calculating away.
While going back through our reports, I noticed that in September we had
an overage marked in Observium as 11.4Mbps (Actual usage 61.4Mbps). However
the bill we got from the ISP gave us an overage of 30.38Mbps (Actual usage
80.38Mbps). So I went to look deeper and got the break downs I needed.
Our ISP gave us the following for the highest 95th:
Link1: 50.375Mbps
Link2: 30.005Mbps
Total: 80.38Mbps
I then looked on Observium for the graphs for the two ports, and they reported
the following for the highest 95th:
Link1: 49.64Mbps
Link2: 30.44Mbps
Total: 80.08Mbps
I can accept that two different systems there may be a very small discrepancy
with the larger numbers - which is fine, however -- the problem arrives
when the billing calculations comes in, and shows the values as above (11.4Mbps
over, 61.4Mbps usage). I have uploaded the two port graphs and a screen
grab from the billing page to show in more detail the above numbers here:
http://imgur.com/a/iErfo
I just want to check I have not missed something that is staring me in
the face in regards to the calculations, and if I am, please let me know!
Thanks in advance.
Regards
Colin Barker
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