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[IDD #WMT-338636]: Upstream Data Feeds
- Subject: [IDD #WMT-338636]: Upstream Data Feeds
- Date: Mon, 28 Jul 2014 16:31:18 -0600
Hi Tim,
re:
> Hello, my name is Timothy "Connor" Nelson. I am a student at South Dakota
> School of Mines and Technology. Currently, our school has an LDM set up for
> Gempak; however, I need to set one up on a separate computer for field
> research that a research team would be using.
OK.
re:
> I am not the one operating
> the other LDM at the University. This other one needs to be left alone and
> not changed.
The most efficient way (meaning the way to minimize network bandwidth use)
is for one LDM at an institution to relay data to the other LDM(s). In
order to do this, the ~ldm/etc/ldmd.conf file for the original machine
would need to be edited to add appropriate ALLOW(s) for the other machine(s)
it would relay data to. This assumes, of course, that the LDM to act
as a relay has the data that the other machines want/need.
re:
> I'm not sure if we are qualified for IDD,
You are.
re:
> but if we are,
> here's the information for upstream data feeds required. Again, I am
> setting up a separate LDM from the one our school is currently using. Thus,
> we would have multiple LDM's for different computers and different projects:
> ...
> So, for this project (A10) here's the information:
>
> Site: South Dakota School of Mines and Technology
> LDM Administrator: Timothy "Connor" Nelson
> Phone: 740-505-1902
> email: address@hidden
> hostname: MI-RM201A-03L
What we need is the fully-qualified hostname and IP address of
your machine. The other thing that is needed is forward (name to IP)
and reverse (IP to name) DNS to be setup for your machine. When
both forward and reverse DNS are available for an '.edu' machine,
one is assured that feed REQUESTs to most upstream hosts will be
honored/work.
re:
> feedtypes: FNEXRAD, WSI, NEXRAD3, NEXRAD2, NXRDSRC
Comments:
- the feeds of interest are not being REQUESTed by the existing
SDSMT machine running the LDM, unidata.sdstate.edu
This means that that your new machine would REQUEST the feeds
directly from upstream feed host(s).
- WSI is a proprietary point-to-point feed from WSI corporation.
The WSI feed is not relayed in the Unidata IDD.
- NXRDSRC is used exclusively at NCDC, it is not part of the IDD
Please be aware that the remaining feeds you have indicated that you
want are quite voluminous. Here is a snapshot of the feeds available
in the IDD and their respective volumes:
Data Volume Summary for shemp.unidata.ucar.edu
Maximum hourly volume 30945.209 M bytes/hour
Average hourly volume 20895.266 M bytes/hour
Average products per hour 366853 prods/hour
Feed Average Maximum Products
(M byte/hour) (M byte/hour) number/hour
NEXRAD2 7242.151 [ 34.659%] 8911.836 82024.646
CONDUIT 4246.638 [ 20.323%] 8809.083 80659.562
NEXRAD3 2292.715 [ 10.972%] 2726.845 107527.625
EXP 1723.898 [ 8.250%] 3763.579 7015.917
NGRID 1573.718 [ 7.531%] 3384.791 21996.458
FSL2 1436.051 [ 6.873%] 1609.331 1684.917
FNMOC 1102.307 [ 5.275%] 6452.797 2941.354
HDS 355.341 [ 1.701%] 616.127 18025.729
SPARE 284.263 [ 1.360%] 1728.201 10.333
NIMAGE 206.857 [ 0.990%] 405.009 219.958
FNEXRAD 122.984 [ 0.589%] 148.102 106.250
GEM 103.601 [ 0.496%] 666.644 965.000
UNIWISC 66.769 [ 0.320%] 129.483 46.146
NOTHER 53.723 [ 0.257%] 368.726 1065.208
IDS|DDPLUS 53.363 [ 0.255%] 65.480 42186.125
PCWS 18.225 [ 0.087%] 23.542 23.250
LIGHTNING 11.969 [ 0.057%] 26.679 353.021
DIFAX 0.586 [ 0.003%] 2.786 0.917
GPS 0.108 [ 0.001%] 1.345 1.042
Question:
- do you have enough network bandwidth to get all of the feeds that you
desire:
NEXRAD2 7242.151 [ 34.659%] 8911.836 82024.646
NEXRAD3 2292.715 [ 10.972%] 2726.845 107527.625
FNEXRAD 122.984 [ 0.589%] 148.102 106.250
The reason that I ask is I seem to recall that there were bandwidth issues
in the past at SDSMT.
Please send us the fully qualified hostname and IP address of your new machine
so that we can verifiy that DNS has been correctly setup for it.
Cheers,
Tom
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Ticket Details
===================
Ticket ID: WMT-338636
Department: Support IDD
Priority: Normal
Status: Closed