Re: 20011008: IDD latencies at PSU (cont.)

"Arthur A. Person" wrote:
> 
<snip>
> >  9  penn-state.psc.net (198.32.224.66)  35.435 ms  35.531 ms  35.402 ms
> > 10  * * *
> > 11  ldm.meteo.psu.edu (128.118.28.12)  37.173 ms  55.206 ms  37.258 ms
> > 12  ldm.meteo.psu.edu (128.118.28.12)  37.062 ms  36.466 ms  36.573 ms
> >
> > Is the 10th hop due to a firewall?
> 
> Beats me.  I'll have to check and see why it would be hopping again it
> that's what's actually happening.
> 

The double hop at ldm.meteo does seem odd.

> >
> > Just to confirm, you're seeing products *arriving* late, as opposed to
> > being filed late, is that correct?  Did you determine this via 'ldmadmin
> > watch'?
> 
> Yes, arrival is all I'm looking at using ldmadmin watch and also the
> .stats files.  This systems doesn't do any data processing, only relaying.
> I do have it handling a print queue at the moment, but that should be
> peripheral to this problem.  If you'd like to log on an take a look at
> anything, let me know and I'll set up an account.
> 
> Would it be worth anything for me to try a failover site like SSEC just to
> see if things work okay there?  This is pretty strange.
> 

Yeah, this is strange.  Switching to SSEC sounds like an interesting
test.  Might as well give it a try.

> 
> Okay, let's keep an eye on it for a little while.  I think our ldm is
> pretty tight on security but no sense taking chances.
> 

I've been doing traceroutes all day.  I attached a text file showing the
result of just under 300 traceroutes over the course of roughly 6
hours.  (Please let me know if there's a problem with the attachment.) 
It shows over 90% arriving within 40ms, judging from the first column
only.  There are a few in the 90ms range, and a few over 100ms. 
However, all in all, these times seem fine.

Has your problem been occuring consistently all day?  If so, I'm ready
to end this experiment, because I don't believe it's showing us
anything. 

Anne
-- 
***************************************************
Anne Wilson                     UCAR Unidata Program            
address@hidden                 P.O. Box 3000
                                  Boulder, CO  80307
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Unidata WWW server       http://www.unidata.ucar.edu/
****************************************************

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