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[LDM #QXS-738090]: ldm questions

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  • Subject: [LDM #QXS-738090]: ldm questions
  • Date: Wed, 17 Oct 2012 13:13:39 -0600
Hi Mike,

re:
> Thanks a lot for your reply.  I will check with our IT support to see if
> they can figure out why the latency is so large.
> Please find the ldmd.conf and pqact files that we are using.

I think that the cause of the high latencies that you are requesting too much
(volume/#products) on single feeds.  Here are the REQUEST lines I am referring
to from your ldmd.conf file:

REQUEST UNIDATA|NNEXRAD|FSL2|CONDUIT|FNEXRAD|NIMAGE|UNIWISC ".*" 
flood.atmos.uiuc.edu
REQUEST UNIDATA|NNEXRAD|FSL2|CONDUIT|FNEXRAD|NIMAGE|UNIWISC ".*" 
idd.unidata.ucar.edu

I recommend that you split these feeds.  Here is one split to try first:

REQUEST WMO|FNEXRAD    ".*"    flood.atmos.uiuc.edu
REQUEST NIMAGE|NEXRAD3 ".*"    flood.atmos.uiuc.edu
REQUEST FSL2|UNIWISC   ".*"    flood.atmos.uiuc.edu
REQUEST CONDUIT        "[09]$" flood.atmos.uiuc.edu
REQUEST CONDUIT        "[18]$" flood.atmos.uiuc.edu
REQUEST CONDUIT        "[27]$" flood.atmos.uiuc.edu
REQUEST CONDUIT        "[36]$" flood.atmos.uiuc.edu
REQUEST CONDUIT        "[45]$" flood.atmos.uiuc.edu

REQUEST WMO|FNEXRAD    ".*"    idd.unidata.ucar.edu
REQUEST NIMAGE|NEXRAD3 ".*"    idd.unidata.ucar.edu
REQUEST FSL2|UNIWISC   ".*"    idd.unidata.ucar.edu
REQUEST CONDUIT        "[09]$" idd.unidata.ucar.edu
REQUEST CONDUIT        "[18]$" idd.unidata.ucar.edu
REQUEST CONDUIT        "[27]$" idd.unidata.ucar.edu
REQUEST CONDUIT        "[36]$" idd.unidata.ucar.edu
REQUEST CONDUIT        "[45]$" idd.unidata.ucar.edu

NB::

- after making changes to ldmd.conf, one needs to stop/restart
  the LDM:

<as 'ldm'>
ldmadmin stop
ldmamdin start
  OR
ldmadmin restart

- your original REQUEST lines were doubling up on the REQUESTs
  for the UNIWISC (aka MCIDAS) feed.

  UNIDATA == WMO|UNIWISC == IDS|DDPLUS|HDS|UNIWIS

re:
> Thanks again for your help!

No worries.  Let's start with splitting your feed REQUESTs and worry
about the other issues you raised later.

Cheers,

Tom
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Ticket Details
===================
Ticket ID: QXS-738090
Department: Support IDD
Priority: Normal
Status: Closed