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The RRD SNMP graph shows 5-minute
averages of octets counted at an interface, while the perfSONAR
toolkit graph shows the average throughput result of 20-second
(probably) tests. So the averages will show lower numbers than the
test results. If you ran a 5 or 10 minute bwctl test, you would
see a distinct feature on the SNMP graph, but a 20 second test
doesn't influence a 300 second average very much.
On 5/21/2014 9:21 AM, Daniel Doyle wrote:
Devine,
Looking at your attached picture I feel that I might not be
getting the full picture here. As you said that these are two
graphs representing traffic over the same link I do not see how
the SNMP monitored one can show less traffic than the BWCTL
throughput test (perfSONAR). If anything I believe only the
inverse could be true where the SNMP monitored one will simply
show all traffic going across that link whereas the perfSONAR
one will only show traffic generated from the test, which is a
subset of or at most equal to the total link traffic. Before I
could weigh in any more it might be helpful to double check that
and/or explain a little more about your setup and what you are
trying to accomplish and where these measurements are coming
from. Of particular use would be to know the sampling interval
on each as if the sampling for the SNMP is relatively slow, say
every 5 minutes or so, that could account for the difference.
Regardless though I believe that assuming they both utilize the
same link the total traffic passed will be indicated on the SNMP
counters.
With respect to getting at the raw data in perfSONAR, you
could use direct SQL access. Someone else might weigh in here
differently but I would probably recommend checking out the SOAP
based API for the existing Measurement Archive (MA) as it takes
care of some of the more underlying bits in terms of tables and
columns and joining it all together for you. I believe a decent
starting point might be here: http://psps.perfsonar.net/client-doc.html .
It's also worth nothing that there is a new version of the MA
that is coming out with a RESTful API that should be easier to
use, but that's likely a few months away and may not meet your
timing needs.
-Dan
On May 21, 2014, at 7:50 AM, Tshabalala, Devine (Mr)
(s210051701) <>
wrote:
Thank you Daniel.
Are there any people who are capable and can help
out (especially on technical implementation ).
The attached
is a screen shot of two different screens
monitoring the same link (10 gig link). Screen
1 monitored by SNMP (production traffic)
and screen 2 monitored by perfSONAR (throughput
being utilized). The two graphs have to be
visually compared to determine the total
bandwidth being utilized. Hence, l want to
integrate these tools to generate a consolidated
network performance monitoring report to
effectively manage bandwidth
utilization. So what can be the challenges that
l need to look at when it comes
to integrate perfSONAR
and other tools? Also l want to know, how the
database table formats look like.
Thank you
:-)
Kind
regards
DevineTshabalala
Masters
Student
Department
School of ICT : l.T. Communication
Networks
(North
Campus)
Tel: 078 491 6130
A
successful man is one who can lay a
firm foundation with the bricks
others have thrown at him and
Action
is the foundational key to all
success.
From: Daniel
Doyle <>
Sent: Tuesday,
May 20, 2014 10:56 PM
To: Tshabalala,
Devine (Mr) (s210051701)
Cc: ;
Subject: Re:
[perfSONAR-developer] [perfsonar-user] Updated
Statement on Researcher Participation
Hi Devine,
Firstly, thanks for taking an interest in
perfSONAR! To answer your question, I don't
think anyone is aware of any formal efforts to
correlate perfSONAR and SNMP data, though it's
certainly possible that there might be informal
or side efforts in the community that could be a
starting place. I am forwarding this email over
to our users list to see if anyone wants to
chime in with anything they might be up to that
could be a foothold for this.
Certainly feel free to ping either the
developer or the user list if you have any other
questions.
Thanks,
-Dan
On May 19, 2014, at 8:09 AM, Tshabalala,
Devine (Mr) (s210051701) <>
wrote:
hi
Hope all is well :-). l
am a masters student at Nelson
Mandela Metropolitan
University in South Africa. l
am networks passionate
student, wanting to do a
research on network monitoring
and performance. I just wanted
to ask if they has been
project that correlate of
perfSONAR and SNMP (or
similar) data? l have an
interest of researching
towards that direction?
Therefore, l am searching for
some hints and guidance on how
to tackle such a situation.
You assistance would be
greatly appreciated..
Kind
regards
DevineTshabalala
Masters
Student
Department
School of ICT : l.T.
Communication Networks
(North
Campus)
Tel:
078 491 6130
A
successful man is
one who can lay a
firm foundation
with the bricks
others have thrown
at him and
Action
is the
foundational
key to all
success.
Dan Doyle
GlobalNOC Software Developer
1-812-856-3892
--> <inteer.PNG>
Dan Doyle
GlobalNOC Software Developer
1-812-856-3892
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