>From: Robert Leche <address@hidden> >Organization: LSU >Keywords: 200403081533.i28FXNrV006465 IDD latency Bob and Adam, Bob wrote: >I wanted to let you know that I have taken notice of the RTSTATS Index >by Site for tornado.geos.ulm.edu. I see wide oscillations of 2 to 8 >thousand second delays. This problem seems have reoccurred or started >last Thursday. I was hoping the problem would 'go away' over the >weekend, but it has not. I will initiate a trouble ticket and have our >LSU telecommunications group check into this. I took a quick look at the latency plots for the IDS|DDPLUS feed on tornado, and see the high latencies you are referring to: http://my.unidata.ucar.edu/cgi-bin/rtstats/iddstats_nc?IDS|DDPLUS+tornado.geos.ulm.edu I note, however, that tornado is redundantly feeding from seistan and stokes.metr.ou.edu and the latencies from both feed paths are equally bad. To me this means that the problem is likely at ULM and not necessarily at LSU. Adam, Can you check with your network folks to see if there is any known problems at ULM? Also, I would ask if packet shaping has been implemented. I suspect that there has been some kind of an imposed slowdown since the latencies for feeds that have low number of products (e.g., UNIWISC, FNEXRAD) are significantly better than for feeds that have large numbers of products (e.g., IDS|DDPLUS, HDS). Cheers, Tom -- NOTE: All email exchanges with Unidata User Support are recorded in the Unidata inquiry tracking system and then made publically available through the web. If you do not want to have your interactions made available in this way, you must let us know in each email you send to us. >From address@hidden Fri Mar 12 13:00:49 2004 Last Thursday we starting taking in alot more nexrad data. I will comment this out to see if it helps the latencys. Also, we have completely maxed the I2 bandwidth out on campus and are in the process of aloting more (3 to 12). Another project that I am working on for the campus is a multicasting video conference room. We starting testing on Thursday also. That's where the maxing of the I2 came from. With it off however we are below the maximum. Adam
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