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=============================================================================== Robb Kambic Unidata Program Center Software Engineer III Univ. Corp for Atmospheric Research address@hidden WWW: http://www.unidata.ucar.edu/ =============================================================================== ---------- Forwarded message ---------- Date: Thu, 26 Aug 1999 17:56:39 -0600 (MDT) From: David Himes <address@hidden> To: address@hidden address@hidden, address@hidden, address@hidden, address@hidden Subject: Re: No WSI feed from wsihcsn.unidata.ucar.edu to iita at 99082610 Hi all, I only have time for a couple of comments right now(they're below) and will send out more tomorrow, when I get back to work. dave According to Peter Neilley: > > All: > > I'd like to summarize/paraphrase Robb's note and other facts > to help understand where we are now and what we need to > do to correct this issue: > > - Large WSI data latencies between wsihcsn and iita started appearing last > week once the iita (Linux box) was upgraded to LDM 5.0.8. At first, > there > was some speculation that these latencies were associated with > work/changes > in the network at FL4, but that theory has been discounted by Mike S. now > that those changes are fixed/completed. > > - Before last week, and ever since the new iita machine was installed last > spring, latencies between wsihcsn and iita were trivial. > > - Have there been any substantial changes in the volume of data feeding > iita? > There were some reports on the ldm-users email list that NOAAPORT NIDS > products were getting through onto the IDD. Chiz fixed a regular > expression pattern on thelma, but perhaps a similar fix needs to get > in place on iita? Are there loads of NOAAPORT NIDS products arriving > at iita directly from the UCAR NOAAPORT that are overwhelming iita? > If this is not an issue, I know of no other changes in the datafeeds > or the load on iita that bear on this problem. > > - Robb increased the pq size on iita, and cleaned up some rouge ldm > processes on iita. This did not improve the situation. > > - Robb reported that ldmping from wsihcsn was refused by iita. This was > corrected by "allow"ing wsihcsn at iita, but no improvement in > throughput. > > - Robb reports problem with rpcinfo. We talked with our systems folks > (ie Tres) and we don't know how to interpret this error, nor what > to do about it. > > - Robb suggests the problem might be with the firewall since sites outside > the firewall (like wsihcsn) are not seeing latencies: Questions: > > a) Why are so many sites getting data from wsihcsn? Who is > shemp and torrent? Are they both FL4 sites? If so, one should > feed the other. Why is ldm.comet getting data from wsihcsn > rather than iita? Is that just a short term solution to get > timely data to comet until this problem is solved? I requested a feed from wsihcsn just yesterday, pending resolution of this problem with latencies to iita. So, it has only been enabled for about 24 hours. I have not been monitoring it close since then, but we are running about 5 to 10 minutes latency right now. > b) Are sites that are getting the data timely running v5.0.8? Are > any LINUX boxes? We're still at 5.05. > > > Have I summarized correctly? Where do we go from here? I'll comment more tomorrow.:w > > Peter Neilley, NCAR/RAP > address@hidden > 303-497-8446 >