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20050106: RTSTATS question



Celia,

Yes, the times are latency for a product.

You have a machine "clamp" that is feeding from both
thelma.ucar.edu and f5.aos.wisc.edu as you see here:
http://my.unidata.ucar.edu/cgi-bin/rtstats/iddstats_nc?CONDUIT+clamp.rap.ucar.edu

You also see that alost the entire volume yopu are receiving is coming via
thelma, and very little via f5:
http://my.unidata.ucar.edu/cgi-bin/rtstats/iddstats_vol_nc?CONDUIT+clamp.rap.ucar.edu

I suspect that your queue isn't large enough to hold 1 hours worth of data,
and that periodically, you receive an old product from f5 that you already 
received from thelma, but has since been scoured out of your queue-
so you receive it a second time from the redundant feeder.

You can use the ldm program "pqmon" to show you the age of the oldest product 
in your
queue. If this is falling below 1 hour (3600 seconds) and you are feeding from
more than 1 host, you could receive a product that you had previously received
but has since been scoured out of your queue to make room for new data.

Steve Chiswell
Unidata User Support






>From: Celia Chen <address@hidden>
>Organization: UCAR/Unidata
>Keywords: 200501062146.j06Lkiv2014808

>Dear support,
>
>Under CONDUIT, in the "RTSTATS Index by Site IDD Topology Feed List", it
>I saw the following:
> 
>level.rap.ucar.edu [512 seconds]
>
>      rasp.rap.ucar.edu [2208 seconds]
>
>clamp.rap.ucar.edu [3880 seconds]
>
>      rasp.rap.ucar.edu [3886 seconds]
>      level.rap.ucar.edu ** Redundant loop **
>
>Could you tell me if the number of seconds in [] are
>latency in time?  If so, what could cause the large latency shown
>on some of our ldm hosts that get the CONDUIT feed?
>
>
>Thanks in advance.
>
>Celia
>
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