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The LDM queue at NWS is now 1.5GB.
Since the CONDUIT meeting in January 2002 in Orlando, FL, the AVN data set has been extended from 120 hours to 180 hours, and we now have 20km RUC grids.
The data volume per hour has approached 1.8GB/hour at the peak, though most of the time the data rate is in the .9GB to 1.4GB per hour range. See:
<http://www.unidata.ucar.edu/software/idd/rtstats/>
There were some hardware problems at UCAR/NCAR when the old thelma.ucar.edu
IDD relay machine was upgraded to a PC. Due to the problems, the PC has been
replaced by a Sun Workstation which is currently serving as the relay host.
Since that change (coincident with the NCAR power shut down), the LDM here has
been running fine and the latency of products reaching thelma.ucar.edu is steady:
There was an initial problem when thelma.ucar.edu began to relay CRAFT products. The total data volume per hour of all our IDD data, CONDUIT data, and NEXRAD Level II data exceeded our 2GB queue (2GB is the maximum size of a queue when the LDM is compiled using the traditional configuration). Since then, the queue on Thelma was increased to 7GB by compiling the LDM with large file support. We seem to be relaying all our IDD traffic fine with this configuration, so it is a good test for sites that will want to have larger queues with the LDM.
When time permits, Anne Wilson will test the netnews server with some (ETA 12-km) data. The basic limitation with the LDM will be the maximum queue size.
The current sites include:
UCAR 3 unique:
JOSS
RAP
Unidata
University 11 unique + 4 other machines within those:
Illinois
Washington
Penn State
SUNY-Albany
Du Page
Arizona
Iowa State
Utah
Colorado State
Univ of Wisconsin-Madison
Univ of Oklahoma
Steve Chiswell, Unidata Support
Linda Miller, External Liaison
University Corporation for Atmospheric Research
P.O. Box 3000
Boulder, CO 80307-3000
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