[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

Re: No WSI feed from wsihcsn.unidata.ucar.edu to iita at 99082610 (fwd)


===============================================================================
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
>