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Re: 20011008: IDD latencies at PSU (cont.)
- Subject: Re: 20011008: IDD latencies at PSU (cont.)
- Date: Tue, 09 Oct 2001 16:12:19 -0600
"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
----------------------------------------------------
Unidata WWW server http://www.unidata.ucar.edu/
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