20031009: LDM question with regards to system name vs. ip address

>From: "Kirby Cook" <address@hidden>
>Organization: NOAA/NWS/WR
>Keywords: 200310092121.h99LLeOb009106 LDM-5 upgrade

Hi Kirby,

>I've noticed a peculiarity with regard to a couple of systems that we
>have running ldm 5.1.4. I've noticed that I get the following errors on
>the server (galileo) when the client (ls1-vhw) requests data using the
>server name (galileo.wrh.noaa.gov) as opposed to the ip address in the
>ldmd.conf file:
>
>
>     Oct 09 20:35:42 galileo ls1-vhw[21562]: Connection from
>     ls1-vhw.wrh.noaa.gov
>     Oct 09 20:33:42 galileo ls1-vhw(feed)[21562]: Starting Up:
>     20031009193754.747 TS_ENDT {{FSL5,  ".*mm5extd1.*"},{FSL2,
>     ".*enp.*"}}
>     Oct 09 20:33:42 galileo ls1-vhw(feed)[21562]: topo:
>     ls1-vhw.wrh.noaa.gov FSL5|FSL2
>     Oct 09 20:38:59 galileo ls1-vhw(feed)[21562]:
>     nullproc(ls1-vhw.wrh.noaa.gov): RPC: Unable to receive
>     Oct 09 20:38:59 galileo ls1-vhw(feed)[21562]: Exiting
>
>Regardless of this error, the data seems to be flowing without any
>problems, and I get no errors in the logfiles on the client.
>
>Conversely, I get no errors on the server if the request is made using
>the ip address from the client.
>
>Is this something that I should be concerned about.

No.  You should not be concerned with those ldmd.log messages.

I strong recommend is that you upgrade all machines running LDM-5.x to
our latest LDM release, LDM-6.0.14.  LDM-6 is _much_ more efficient in
moving data that LDM-5 both on the client (receiver) and server
(sender) sides.  It also has a number of bugfixes and enhancements that
are useful.  LDM-6 is only available in source form, so you will have
to build the distribution yourself on your target machine.  As long
as you have a complete development environment, this is a simple
process that should take no more than a few minutes.

Another reason we are very eager for sites using LDM-5 to upgrade is
LDM-6s ability to report real time statistics back to us.  Users can
then monitor how well their system are performing by reviewing a number
of different displays online:

Real-Time IDD statistics
http://www.unidata.ucar.edu/staff/chiz/rtstats
  Statistics by Host
  http://www.unidata.ucar.edu/staff/chiz/rtstats/siteindex.shtml

Clicking on a hostname gives a page that shows all of the feeds a site
is receiving and provides links to plots of:

latency
log(latency)
histogram of latencies
volume of feed received
number of products received in a feed
topology

Differential latency plots (the latence from your immediate upstream
feed site to you) can be displayed through links on the 'topology'
link.

The real time stats plots make it easy for a site to self monitor their
data reception allowing them to make adjustments based on solid
information when they are having problems.

Turning on reporting of real time statistics in LDM-6 is simple: add
the following line to your ~ldmd.conf file:

exec    "rtstats -h rtstats.unidata.ucar.edu"

So, we are asking you to upgrade to the current LDM release as soon
as you can.

>Thanks in advance.

No worries.

>Kirby Cook
>Western Region Headquarters, NWS

Cheers,

Tom Yoksas