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Re: 20010806: bout halo in City College of New York

Unidata Support wrote:
> 
> ------- Forwarded Message
> 
> >To: address@hidden,
> >To: address@hidden
> >cc: address@hidden,
> >cc: address@hidden,
> >cc: address@hidden
> >From: David Knight <address@hidden>
> >Subject: Re: about halo in City College of New York
> >Organization: UCAR/Unidata
> >Keywords: 200108061915.f76JF1122065
> 
> Xiaodong Yan,
>      First, you should send all computer related problems
> to address@hidden - this way whoever is available first
> can respond to you.
> 
>      Nothing has changed at this that should effect you (at I don't think
> it has).
> 
> I've noticed that frequently after network problems that the ldm product
> queue gets corrupted.
> 
> I suggest you
> 1) stop the ldm on halo (actually since I don't see any entries from halo
>    in our log files I suspect it is already down)
> 2) recreate the ldm product queues
> 3) restart the ldm on halo.
> 
> Then we can see what if anything shows up in our logs here from halo.
> 
> I do notice some strange things with halo:
> 
> Ping seems to be very inconsistant:
> ping -s halo.sci.ccny.cuny.edu
> PING halo.sci.ccny.cuny.edu: 56 data bytes
> 64 bytes from halo.sci.ccny.cuny.edu (134.74.52.189): icmp_seq=0. time=17. ms
> 64 bytes from halo.sci.ccny.cuny.edu (134.74.52.189): icmp_seq=1. time=10. ms
> 64 bytes from halo.sci.ccny.cuny.edu (134.74.52.189): icmp_seq=2. time=472. ms
> 64 bytes from halo.sci.ccny.cuny.edu (134.74.52.189): icmp_seq=3. time=186. ms
> 64 bytes from halo.sci.ccny.cuny.edu (134.74.52.189): icmp_seq=4. time=202. ms
> 64 bytes from halo.sci.ccny.cuny.edu (134.74.52.189): icmp_seq=7. time=11. ms
> 64 bytes from halo.sci.ccny.cuny.edu (134.74.52.189): icmp_seq=8. time=40. ms
> 64 bytes from halo.sci.ccny.cuny.edu (134.74.52.189): icmp_seq=9. time=2646. 
> ms
> 64 bytes from halo.sci.ccny.cuny.edu (134.74.52.189): icmp_seq=10. time=2482. 
> ms
> 64 bytes from halo.sci.ccny.cuny.edu (134.74.52.189): icmp_seq=11. time=2432. 
> ms
> 64 bytes from halo.sci.ccny.cuny.edu (134.74.52.189): icmp_seq=12. time=1781. 
> ms
> 64 bytes from halo.sci.ccny.cuny.edu (134.74.52.189): icmp_seq=13. time=1313. 
> ms
> 
> Also, ldmping produces portmapper errors -
> 
> ldmping -v -l - -h halo.sci.ccny.cuny.edu
> Aug 06 18:57:29      State    Elapsed Port   Remote_Host           rpc_stat
> Aug 06 18:57:41      NAMED  12.040540    0   halo.sci.ccny.cuny.edu  can't 
> contact portmapper: RPC: Timed out
> 
> I suspect there might still be either network problems at ccny, or,
> perhaps a problem with halo. You might want to reboot that machine
> to see if that helps.
> 
> I've cc'ed this to address@hidden in case they have
> some insight to share.
> 
> David
> 
> >
> > Dear Dr. Knight,
> > My name is Xiaodong Yan, a computer system administrator in City College of
> > New York. Professor Hindman here ask me to help him figure out the problem
> > with halo (halo.sci.ccny.cuny.edu, our ldm machine to get data) which isn't
> > getting new data from the host "redwood.atmos.albany.edu".
> >
> > It happened last week, about August 02, when there is a college wide network
> > congestion problem. Shortly after that halo isn't getting any new data. I
> > try to figure out the problem, apparent the server "redwood" is still
> > online, and halo has no problem to "ping" it. But when I use the "ldmping",
> > I got following messages:
> >
> > Aug 06 18:10:20 SVC_UNAVAIL   0.034723    0   redwood.atmos.albany.edu
> > h_clnt_create(redwood.atmos.albany.edu): Connection refused
> > ..................( repeats)
> > Aug 06 18:10:45 SVC_UNAVAIL   0.035243    0   redwood.atmos.albany.edu  RPC:
> > Program not registered
> > ..................(repeats)
> >
> > I am not sure where the problem is. Is there any change at redwood at albany
> > that disallow halo from getting new data? Or that's a problem with
> > configuration here. Since we didn't make any changes recently, I hope you
> > may give me clue about what we can
> > do to get new data.
> >
> > regards,
> > Xiaodong
> > =================================
> > Mr. Xiaodong Yan
> > System Administrator, Science Computing
> > Room: Marshak Science Building, J-302
> > City College of City University of New York
> > New York, NY 10031
> > Tel: 212.650.7885
> > Email: address@hidden
> > Backup: address@hidden
> > =================================
> >
> >
> 
> ------- End of Forwarded Message

Hello Xiaodong Yan,

I am the LDM support person at Unidata.  Did you try David's suggestion
of stopping the LDM, rebuilding the queue, and restarting?  If so, how
did that work for you?

Anne
-- 
***************************************************
Anne Wilson                     UCAR Unidata Program            
address@hidden                 P.O. Box 3000
                                  Boulder, CO  80307
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Unidata WWW server       http://www.unidata.ucar.edu/
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