19990426: no obs in gempak surface files 4/26

David,

My files appear fine. Several things to check:

1) make sure you haven't filled up your disk recently

   If you disk fills up, then a zero length output file
   will likely be created, which will not be a valid gempak data
   management file, and no data can be written into it once
   disk space is available.

2) Make sure your table directories are available 
   
   The pqact.conf entry generally uses command line options that point
   to your station and packing tables. If these move, or are not
   readable by the LDM process, you won't get very far.

3) Check the ldmd.log and dchrly and dcuair.log files for clues.
   
   If your system time is off, or directories are not writable,
   then you should have some messages.

   If your pqact.conf files was edited...and maybe an entry before
   the gempak decoders is messed up, then pqact will usually log 
   a message in ldmd.log about the pqact.conf file and line number.

   Also, check tabs in the pqact.conf file if anything has been
   changed recently. You can force a re-read of pqact.conf by issuing
   a kill -HUP to the pqact process. See if rereading the file
   mentions any configuration errors.

4) Make sure the ldm process can execute the binaries
  
   Ocassionally, especially with Solaris, the LD_LIBRARY_PATH gets
   updated or messed up and one or more of the shareable libraries
   cannot be found. Test this by typing: ldd dchrly and ldd dcupair.

   If any shared libraries cannot be found, ldd will mention it.

5) check the process list for dchrly and dcuair for hung processes,
   or perhaps they are just writing to a different location if
   a symbolic link in a directory has changed etc.


Steve Chiswell
Unidata User Support
   

On Mon, 26 Apr 1999, David J. Knight wrote:

> Here is a weird one...
> 
> We are getting no data written to our gempak surface
> or upper air files today 4/26/99. The data seems
> to be comming in via idd, but not getting decoded
> into gempak files. Near as I can tell none of our
> config files have been changed. ship and synops seem
> fine.
> 
> Before I pull out my few remaining hairs, can somebody
> tell me if they are experiencing the same problem?
> I'd hate to spend time looking for a local problem
> if it doesn't exist...
> 
> Thanks
> David
> 
> David Knight
> Department of Earth and Atmospheric Sciences   Tel: (518)-442-4204
> SUNYA   ES-228                                 Fax: (518)-442-4494
> Albany, NY  12222                              Email: address@hidden
> 
>