perfSONAR User Q&A and Other Discussion

[Winnie Lacesso <>]

Dear Wise Gurus,

Although both Bristol perfsonar hosts are ok in the monitoring, I 
think there are problems. 

BW borken Sun 23 Aug?
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In early May 2015 Andrew Lake pointed out 

> - I was also able to reach your web page which allowed me to look at the  
> mesh config file you are using at
> https://myosg.grid.iu.edu/pfmesh/mine/hostname/lcgnetmon02.phy.bris.ac.uk
> 
> The way this is configured, you are only running BWCTL throughput tests 
> to hosts in the UK. You then have a very large mesh of traceroute tests 
> you are running. That means for a whole bunch of those hosts listed on 
> the graph page I wouldn't expect any throughput data. My guess is that 
> this is expected, but just pointing it out in case it's not.

A guess is whoever in UK is the Perfsonar Expert set it up like that for
UK sites. Fine. To me this says in looking at the graph pages, only look 
for data btw us & other UK sites. Fine.

http://lcgnetmon02/serviceTest/psGraph.cgi

Click on a UK site on the left eg hepsonar1.ph.liv.ac.uk (138.253.60.81)
& it shows no graph; scroll down shows 1 tiny spike Friday (11 Sep) noon.
Click on 1m however & it shows the reverse throughput data stopped looks 
like Sun 23 Aug; same date the throughput data becomes a straight line to
about 11 Sept.
For t2ps-bandwidth.physics.ox.ac.uk, similar but the straight 
throughput line carries right on to now & there are quite a few red-dot 
errors too.

For lcgps02.gridpp.rl.ac.uk, the dates are same (something happened 23 
Aug) but this time it's the reverse throughput that carries on in a 
straight line, then dips (I think this is bcs this time our BW box is the 
dest not source). Similar for pygrid-sonar1.lancs.ac.uk & 
heplnx130.pp.rl.ac.uk 

Can anyone advise debug+fix?

For many other UK sites though, like bham & cam, mancs, dur.scotgrid, 
there's no graph at all, changing the default 1w to 1m shows zero. It's a 
puzzle there's no data, but no one's saying "your BW box is borken".
Maybe the config does not include tests btw our BW & those hosts. I thought
it used to......

Lat borken Thu 10 Sep just before noon?
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There seems to be LAT data for most worldwide hosts checked (not all), but for
all UK hosts (only!) something happened Thu 10 Sep just before noon - one of
the graph lines abruptly stops. Not true for non-UK hosts. Does this indicate
a problem with lcgnetmon.phy.bris.ac.uk & if so how to debug+fix?

Grateful for advice!