perfSONAR User Q&A and Other Discussion

[hito <>]

Hello.

Did you check the path?  Is it possible that the path has changed.

Hiro

On 11/26/2019 11:37 AM, Ian Gandon wrote:

Hi All,

 

Bit of a strange issue I’m experiencing and not even sure it sits in this realm but hoping you may have a suggestion.

 

We have a perfsonar test point installation on a device in our local office which has been functioning for a number of months. One of the tests is a bandwidth test which runs every 10 mins. The destination of the throughput test is a CentOS 7 server which exists in our network core at another site. This server also acts as a measurement archive for the node and is a virtual machine. All has been working normally then last Friday evening the bandwidth suddenly dropped to 1.0-1.3 Mbps expected is closer to 100Mb.

 

My first thought was an issue with our network so have done the leg work to investigate and can find nothing wrong. I’ve run several manual iperf3 tests as below:

 

Manual test from our local office to the MA – slow

Manual test from our local office to the MA – Reverse flag – Normal result

Manual test from our local office to a different server on the same VM host – Normal result

Manual test from a different host on a different subnet to the MA – slow

Manual test from a different host on a different subnet to a different server on the same host as the MA – Normal result

Manual test from MA to local office – normal result.

Perfsonar scheduled test from local office to the MA – slow.

 

I’ve been through the perfsonar logs on both the MA and test point but as the test isn’t failing there isn’t much to see. The results above seem to point to something on the MA itself throttling the results as everything outbound from the MA or to a different destination seems to work normally.

 

Any ideas?

 

Thanks for any assistance.

 

 

Ian Gandon

Network Infrastructure Systems Administrator

Direct Dial: +44(0)20 3434 2146
Office: 0844 775 0000
Email:  i

www.onwave.com     

 

 

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