Thanks, Ben, for the legwork. Keep checking...I have a hunch someone's
clock is off and they're spitting out a duplicate and late feed, or
there's bad latency somewhere. I can't check UNIDATA's latency graphs
because they are down right now with "500" errors on their website:
http://www.unidata.ucar.edu/cgi-bin/rtstats/topoindex?tree
Then click on "NEXRAD2" and wait forever for the 500/misconfiguration
error to show.
So here's a request for LDM-6.7.2 and all future versions: That upon an
ldmadmin start, by default (though it can be turned off, in, say
ldmadmin-pl.conf, with a stern warning that this is a bad idea, but can
accomodate those having serious issues that they cannot rectify at the
time), it pings a NIST time server(s). If the server clock is off
more than 10 seconds, the LDM aborts and returns with a message that your
clock is X hours, minutes and seconds off, and needs to be adjusted.
Additionally, as a secondary option, it should check once a day at a time
you determine that it is less than 10 seconds (or under a minute) off. If
it is, the LDM can fire off an email message to root (or other user(s)),
letting you know the problem. I'll be happy to test it. A commercial
group of radar-display programs will exit with an error message if your
clock is off by 10 seconds or more. I really like that, too. If your
radar images or data are being delayed by clocks that are off, that's a
very bad thing(tm).
There's no excuse not to run NTP on *nix, or do an "ntpdate" in crontab
once or twice a day if you are running an LDM or display software.
Also, let me be clear: I am not saying that *this* is the problem we're
seeing, but it would help make this issue easier to solve.
Back to your regularly scheduled panic attack, already in progress.
*******************************************************************************
Gilbert Sebenste ********
(My opinions only!) ******
Staff Meteorologist, Northern Illinois University ****
E-mail: sebenste@xxxxxxxxxxxxxxxxxxxxx ***
web: http://weather.admin.niu.edu **
*******************************************************************************
