20011006: motherlode feed slow?

>From: "Arthur A. Person" <address@hidden>
>Organization: UCAR/Unidata
>Keywords: 200110061836.f96IaT125601

Art,

Sorry I didn't see this before this morning.

>Our feed from motherlode is about 40 minutes behind...  this has been
>happening for several hours according to our users.  Is motherlode having
>a problem, or some networking issue?  Our feed from SSEC and WSI (for
>example) are on-time.

'traceroute's from motherlode to three different machines show a significant
increase at the abilene connection in Denver, but these are not (by an
order of magnitude) as bad as what we were seeing last week:

motherlode.ucar.edu% windfall.evsc.virginia.edu (128.143.142.246), 30 hops max, 
40 byte packets
 1  mlra-n13 (128.117.13.253)  0.393 ms  0.406 ms  0.321 ms
 2  vbnsr-n2 (128.117.2.252)  0.719 ms  0.808 ms  0.462 ms
 3  internetr-n243-104 (128.117.243.106)  0.835 ms  0.750 ms  0.687 ms
 4  denv-abilene (128.117.243.126)  1.745 ms  1.435 ms  2.519 ms
 5  kscy-dnvr.abilene.ucaid.edu (198.32.8.14)  12.757 ms  12.745 ms  12.610 ms
 6  ipls-kscy.abilene.ucaid.edu (198.32.8.6)  21.673 ms  21.931 ms  22.044 ms
 7  clev-ipls.abilene.ucaid.edu (198.32.8.26)  28.459 ms  27.756 ms  28.042 ms
 8  nycm-clev.abilene.ucaid.edu (198.32.8.30)  39.994 ms  42.397 ms  40.916 ms
 9  uva-internet.misc.Virginia.EDU (192.35.48.41)  48.781 ms  48.051 ms  48.335 
ms
10  carruthers1-all-router.acc.Virginia.EDU (128.143.99.2)  48.793 ms  50.587 
ms  48.993 ms
11  garrett-router.acc.Virginia.EDU (128.143.227.55)  48.427 ms  55.669 ms  
56.705 ms
12  windfall.evsc.Virginia.EDU (128.143.142.246)  49.113 ms *  51.171 ms
motherlode.ucar.edu% traceroute ldm.meteo.psu.edu
traceroute to ldm.meteo.psu.edu (128.118.28.12), 30 hops max, 40 byte packets
 1  mlra-n13 (128.117.13.253)  0.397 ms  0.293 ms  0.260 ms
 2  vbnsr-n2 (128.117.2.252)  0.497 ms  0.723 ms  0.714 ms
 3  internetr-n243-104 (128.117.243.106)  0.985 ms  0.655 ms  0.593 ms
 4  denv-abilene (128.117.243.126)  2.250 ms  1.694 ms  1.895 ms
 5  kscy-dnvr.abilene.ucaid.edu (198.32.8.14)  13.265 ms  12.135 ms  12.270 ms
 6  ipls-kscy.abilene.ucaid.edu (198.32.8.6)  21.351 ms  21.388 ms  21.532 ms
 7  clev-ipls.abilene.ucaid.edu (198.32.8.26)  27.697 ms  27.944 ms  27.634 ms
 8  abilene.psc.net (192.88.115.122)  31.044 ms  31.789 ms  30.856 ms
 9  penn-state.psc.net (198.32.224.66)  34.750 ms  35.134 ms  35.304 ms
10  * * *
11  * * *
12  * * *
13 ^C

motherlode.ucar.edu% traceroute sunny.atmos.washington.edu
traceroute to sunny.atmos.washington.edu (128.95.89.38), 30 hops max, 40 byte 
packets
 1  mlra-n13 (128.117.13.253)  0.531 ms  0.237 ms  0.376 ms
 2  vbnsr-n2 (128.117.2.252)  0.525 ms  0.578 ms  0.611 ms
 3  internetr-n243-104 (128.117.243.106)  1.091 ms  0.748 ms  0.603 ms
 4  denv-abilene (128.117.243.126)  1.559 ms  1.391 ms  1.361 ms
 5  sttl-dnvr.abilene.ucaid.edu (198.32.8.49)  30.196 ms  30.232 ms  30.056 ms
 6  hnsp1-wes-S5-0-0.pnw-gigapop.net (198.48.91.77)  29.871 ms  30.391 ms  
30.313 ms
 7  uwbr1-GE5-0.cac.washington.edu (198.107.151.51)  30.106 ms  30.904 ms  
30.213 ms
 8  dustbuster-V49.cac.washington.edu (140.142.150.2)  31.096 ms  31.053 ms  
30.981 ms
 9  sunny.atmos.washington.edu (128.95.89.38)  30.621 ms  31.133 ms  30.483 ms

Are you still seeing the slowness today?

Tom Yoksas

>From address@hidden Mon Oct  8 07:37:49 2001
>Subject: Re: 20011006: motherlode feed slow? 

Our traceroutes this morning (Monday) to motherlode don't look bad (except
for a few blips now-and-then) but we've seen data slowness all weekend I'm
told.  Looking at things this morning, the DDPLUS/HDS stuff is running
about 3-4 minutes behind which isn't bad, but normally this stuff is
within a minute, usually less.  The NEXRAD stuff from SSEC, for
comparison, is within a few seconds of transmission.  Since we're in a
non-peak load time, I'm guessing delays from motherlode will increase as
the data rate increases... we'll see.  Since the traceroutes look pretty
good, it would appear that the data are either being throttled or hitting
severe bottlenecks.  I'll continue to monitor it today.

                                     Art.
Arthur A. Person
Research Assistant, System Administrator
Penn State Department of Meteorology
email:  address@hidden, phone:  814-863-1563