perfSONAR User Q&A and Other Discussion

[Michael Johnson <>]

Hi Brian,

To clarify, the directionality on the charts depends on the URL passed to graphWidget.cgi. If you're 
accessing the charts through the table listing all the tests, the definition of "source" 
and "destination" is very loose. There is no awareness here of which address(es) involve 
the local host, so which gets set to source and which is destination may not match your expectations. 
So if you look at that URL, you can swap source=value1&dest=value2 so you can determine which is 
which.

There is a ticket open in our tracker here -- feel free to add comments if 
the ticket is missing anything.
https://code.google.com/p/perfsonar-ps/issues/detail?id=1001

Thanks,
Michael

On Sun, Dec 21, 2014 at 10:02:22PM +0000, Brian Candler wrote:
> Question: is it normal for "ping" tests to send in only one 
> direction, i.e. outbound from the perfsonar box?
>
> This seems reasonable, but it's not clear in the documentation. 
> What's particularly confusing is that the sample graph at
>
> http://docs.perfsonar.net/using_graphs.html
>
> has legends for both "ping" and "reverse ping", suggesting that ping 
> is checked in both directions (using bwping?) - although the same 
> graph doesn't actually show any ping data.
>
> What I'm actually seeing is pings only sent in one direction (from 
> perfsonar to remote host and back again).  And these tests are shown 
> in the legend as "reverse ping" - there is no "ping" legend.
>
> Is this correct?
>
> Thanks,
>
> Brian Candler.

--
Michael Johnson
GlobalNOC Software Engineering
Indiana University

812-856-2771

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