perfSONAR User Q&A and Other Discussion

["Vedrin Jeliazkov" <>]

Hello Mark,

Thanks for your feedback!

We also noticed this problem a few days ago. One possible thing to check in
GEANT2 RRD MA's config is whether the counters in

/home/taksometro/cricket-data/bandwidth/rt1.bud.hu.geant2.net/so-6_0_0.rrd

are stored indeed in Bps (bytes per second), as reported by the service. They
might have been instead multiplied to become bps (bits per second). However,
even such multiplication could not justify your findings below, so perhaps
only a closer look would reveal the real issue.

Best regards,
Vedrin

Mark Gordon 
<>
 wrote:

> Hello everyone,
> 
>          I was working with querying utilization data from 
> measurement archives when I noticed one was reporting utilization 
> data for an interface greater than it's capacity.  The interface in 
> question is istf-bckp.rt1.bud.hu.geant2.net (62.40.125.65) 
> outbound.  At the time I was querying the utilization was 6% over the 
> capacity, but extending my search backward a little showed that it 
> had been up as much as 60% above capacity.  I queried the MA with the 
> following interface ...
> 
> ....<nmwgt:interface 
>
xmlns:nmwgt="<http://ggf.org/ns/nmwg/topology/2.0/>http://ggf.org/ns/nmwg/topolo
gy/2.0/">
> ....    <nmwgt:hostName>rt1.bud.hu.geant2.net</nmwgt:hostName>
> ....    <nmwgt:ifName>so-6/0/0</nmwgt:ifName>
> ....    <nmwgt:ifDescription>LowQ Link to ISTF 2 (Pr:T-Systems 
> Id:041/3001)</nmwgt:ifDescription>
> ....    <nmwgt:ifAddress>62.40.125.65</nmwgt:ifAddress>
> ....    <nmwgt:direction>out</nmwgt:direction>
> ....    <nmwgt:authRealm>GEANT2</nmwgt:authRealm>
> ....    <nmwgt:capacity>155520000</nmwgt:capacity>
> ....</nmwgt:interface>
> 
> and got the following datum like this back
> 
> ....<nmwg:datum timeValue="1184141100" value="2.5468027626764405E8" 
> valueUnits="Bps"/>
> 
> 2.5468027626764405E8 = 254680276
> 254680276 > 155520000
> 
> Thanks
> -Mark 
>