This archive contains answers to questions sent to Unidata support through mid-2025. Note that the archive is no longer being updated. We provide the archive for reference; many of the answers presented here remain technically correct, even if somewhat outdated. For the most up-to-date information on the use of NSF Unidata software and data services, please consult the Software Documentation first.
Local Data Manager wrote: > > Dear Anne, > > I wonder if you would mind taking a look at the > ldm on windfall. I got a note from Art Person > indicating a name change on what I thought was > our primary host. I will send a copy of this > message to you in a minute. Art says they are > changing from navierldm.meteo.psu.edu to ldm.meteo.psu.edu. > This confuses me, because I don't think there is > any reference to a machine called navierldm in > our request lines. I only see navier. I looked at > the conf files in the /etc directory under the ldm > user. I think this is the right place to look. > But I found that I have ldmd.machinename.conf > files for a different set of machines than I have > listed in the lines of who we accept data from > (as primary and failover): > > #following text added to accept data from primary and failover > sites. > > accept UNIDATA .* ^navier.meteo.psu.edu > accept UNIDATA .* ^ic1q01.cod.edu > accept UNIDATA .* ^blueskies.sprl.umich.edu > > Of the machines listed above, I only have ldmd...conf > files for navier and blueskies. > > Could you verify that I am looking in the right > place to make the necessary changes? > > I have been pretty consumed of late, so I really > appreciate your taking a look at this if you > have a chance. > > Jennie Ack! Jennie, I thought I sent this about 10:00 this morning! ---- Hi Jennie, It's a pleasure to be able to help! You were indeed looking in the right place. In ~ldm/etc/ldmd.conf I just changed the entries specifying navier.meteo.psu.edu to ldm.meteo.psu.edu. I believe that PSU used two names for that machine - navier and navierldm. We discussed that here some time ago because we were also confused by it. Anyway, you're feeding from the new machine now. However, the important lines in the file are not the 'accept' lines, but the 'request' lines. Those are the lines that get you the feed. Truthfully, I'm a little puzzled about 'accept' lines because I was surprised to hear that one of my coworkers, who is knowledgable about the LDM, feels that the 'accept' lines help in some way. My understanding is that the 'accept' lines are necessary only when someone wants to 'pqsend' you a product, which is different than requesting an entire feed. I used my time on windfall as an opportunity to test my understanding - I commented out the 'accept' for ldm.meteo.psu.edu, and the data seems to be coming in fine. If you notice a problem please let me know. Regarding your various ldmd.conf files - you need to have one for your primary feed and one for your failover. In looking at our list of feeds and failovers, we had you listed as feeding from DuPage and failing over to Cornell. We've changed that now to reflect that you're feeding from Penn State and failing over to Wisconsin, based on your current configuration. (I guess DuPage is out of your picture now.) So, you only need ldmd.ldm.meteo.psu.edu and ldm.sunset.wisc.edu. I've modified those files, changing navier.meteo to ldm.meteo where appropriate. I also modified the script ldmfailWrapper that I made for you to get the failover to work properly. You still have an extra failover conf file called ldmd.blueskies.sprl.umich.edu - I'll just let that be. I am off to an appointment, and will address your next question when I get back. Anne -- *************************************************** Anne Wilson UCAR Unidata Program address@hidden P.O. Box 3000 Boulder, CO 80307 ---------------------------------------------------- Unidata WWW server http://www.unidata.ucar.edu/ ****************************************************