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Re: No WSI feed from wsihcsn.unidata.ucar.edu to iita at 99082610 (fwd)


===============================================================================
Robb Kambic                                Unidata Program Center
Software Engineer III                      Univ. Corp for Atmospheric Research
address@hidden             WWW: http://www.unidata.ucar.edu/
===============================================================================

---------- Forwarded message ----------
Date: Thu, 26 Aug 1999 08:49:00 -0600 (MDT)
From: Peter Neilley <address@hidden>
To: address@hidden
    address@hidden, address@hidden
Subject: Re: No WSI feed from wsihcsn.unidata.ucar.edu to iita at 99082610

Dave:

> What triggers these messages?  When the WSI data on disk looks more than some 
> number of
> minutes old?   Does it monitor the WSI stream and detect when the products 
> cease to com
> in? 

Celia can respond more precisely, but I believe its a product count per hour 
threshold
that triggers the messages.  If the data is late (ie WSI data has > 1 hr 
latency) then
the # of products in that hour can be very small or zero and this can trigger 
the
messages.

> Also, how many radars are you guys processing on WSI?  I know you are asking 
> for
> all of the radars, but are you also filing them and doing other processing 
> directly on
> iita?

By policy, iita does not do any data processing.  Not even filing at this 
point.  This
was a change we instituted when we took it over.  Eventually, we may make local 
copies
of the raw datastreams to have a short term archive for distribution to sites 
that
went down for short periods of time, but for now, iita is merely a data traffic 
cop.
I believe our sole responsibility and therefore sole authority with iita 
is to push data around UCAR/Universities.      

All of our data processing is done with RAP-owned machines, including the WSI 
data.
We currently file all 150 radars, and render about 40 of them in real time.  We 
might
be able to render all 150 shortly.  The rendered data are made available via the
web at www.rap.ucar.edu/staff/pneilley/NIDS_table.html.


> 
> Did you and Rob come to any other conclusion about the LDM latency issue 
> discovered
> with the newer ldm?
> 

This is getting annoying.  Its not even clear to me that SCD is aware of the
problem.  Unidata believes the latency is due to SCD mods on the 
network in FL4.  But I'm not convinced.  WSI latency this very moment is small,
but was 25 minutes when I started typing this note.

Peter Neilley, NCAR/RAP
address@hidden
303-497-8446