20 th north america-europe data exchange meeting 22-24 may 2007, darmstadt
Post on 16-Jan-2016
24 Views
Preview:
DESCRIPTION
TRANSCRIPT
© Crown copyright Page 1
20th North America-Europe Data Exchange Meeting
22-24 May 2007, Darmstadt
David Hennings, Met Office
Telecommunication Links Status Report
1. Datalinks
2. Message switching systems
a. WMO/GTS (Frost)
b. File Transfer (Netlink → DART)
3. Dedicated link data Volumes
4. Supercomputer/Model
© Crown copyright Page 3
Main Communications Links from Exeter,… and changes
© Crown copyright Page 4
Message Switching Systems - Frost
© Crown copyright Page 5
Frost WMO Message Switching System
HP UNIX 9000 L3000 servers running HP-UX 11i
Active and Hot Stand-by set-up
Synchronisation via 1Gbs-1 Fibre
1Gbs-1 to LAN for data transfers.
Corobor MessirComm for WMO switching
Nexor Mailer for X.400 & SMTP
© Crown copyright Page 6
GTS Link with NOAA-TOC Washington
BT Frame Relay link – (NOT RMDCN)
64 Kbs-1 Committed Information Rate
Three logical data channels (Alpha-Numeric, GRIB (& T4))
TCP Sockets protocol
Problems: ISDN backup still not functional
Congestion UK to TOC mostly saturated ~50% increase in Received thinned GRIB this year COSMIC data delayed Options:- Upgrade GTS link- Use F/R from NESDIS instead
GTS Volumes (MB/day)
0
50
100
150
200
250
300
350
400
450
Rec Alpha numeric Rec GRIB Trans Alphanumeric
Trans GRIB
2005
2006
2007
© Crown copyright Page 7
GTS Link with NOAA-TOC Washington
Inbound flow may be inhibited due to the saturated Outbound flow being unable to return IP sockets ‘ack’ packets quickly enough.
© Crown copyright Page 8
FTP File Switches - current (Netlink)
Twin HP Alpha server pairs running OpenVMS
Active and Hot Stand-by, manual failover
In-House application for file switching
File switch for Model & Sat products (non-GTS) ~ 140GB/day
Switches fewer messages than GTS (Frost), but 10 times data volume.
Last upgrade Oct 2004, estimated 2 years growth!
Migration to new service in progress
© Crown copyright Page 9
FTP File Switches replacement- (DART file dissemination systems)
Uses commodity Intel servers (Dell)
Multiple, resilient RH Linux-based, cluster pairs in DMZ’z Automatic failover, single service address for each pair
Virus-scanning, hardened systems
Use of DWD ‘AFD’ dissemination engine
Separate customer interface for systems on Internet and WAN
Support for multiple protocols (FTP, Secure, HTTP, SMTP etc)
© Crown copyright Page 10
File transfer links with Nesdis
Issues resolved :
Link to ECMWF upgraded 2MB to 10Mb Migration of private frame-relay tail circuit to new
Nesdis building.
(Outage for period of six weeks due to fault condition)
Emergency usage of backup pathway via the Internet successful during switchover
© Crown copyright Page 11
Data Type Platform File header MB /day (prev) Files
AMSU-A Level 1B NOAA-ATOVSnss.amax 130 (115)
28
AMSU-B Level 1B NOAA-ATOVSnss.ambx 283 (301)
41
HIRS Level 1B NOAA-ATOVSnss.hirx 294 (255)
68
MHS Microwave Humidity Sounder NOAA-ATOVS nss.mhsx 194 (100) 28
HIRS Level 1B (AVHRR mapped to HIRS grid) NOAA-ATOVSnpr.atav 94 (66)
41
NCEP SST derived from AVHRR (100Km) NOAA-ATOVSprd.sst.field >2 (1)
1
QuikScat Seawinds scatterometer data NASA/JPL npr.qbuf 215 (216) 28
AIRS Brightness temperatures NASA –EOS-2 (Aqua)npr.aibt 261 (569)
223
AMSU-A Brightness temperatures NASA –EOS-2 (Aqua)npr.aubt 11 (12)
231
SSM/I Brightness temperatures DSMP npr.sdrr 240 (227) 43
SSMIS Level 1c DSMPnpr.td{E,I,L,U}b 352 (295)
62
Ozone, retrieved profiles and/or total column from
SBUV DSMP
prd.ozone.pmf 5 (1)
82
Total (wef 30 April 2007) 2081 (2158) 916
Present Data Volumes on Washington NOAA (NESDIS) Link
© Crown copyright Page 12
Present Data Volumes on Washington NOAA (NESDIS) Link
Data Volum e changes 2004-07
0
100
200
300
400
500
600
MB/day
2004
2005
2006
2007
© Crown copyright Page 13
Netlink data: NOAA - (NESDIS) Suitland
Daily (5 Minute Average)
Yearly (1 Day Average)
© Crown copyright Page 14
Supercomputing -NEC [2004-]
No change since April 2005 upgrade, the 128-processor NEC SX-8 system doubled the computing power of each of the two existing 120-processor NEC SX-6 systems, which remain operational since April 2004.
See http://www.metoffice.gov.uk/corporate/pressoffice/2005/pr20050412.html
Theoretical peak power of 16 billion calculations per second per processor
© Crown copyright Page 15
SuperComputer Changes
Model Now 2009 2010 2011 2012 2013
Global 40km 40km 25km 25km 18km 18km
50 levels*(*Dec 20070
70 levels 70 levels 70 levels 100 levels 100 levels
N At Eur 12km 8km 8km 5km 5km 5km
50 levels 70 levels 70 levels 70 levels 100 levels 100 levels
UK 4km 1.5km 1.5km ~0.8km ~0.8km ~0.8km
50 levels 70 levels 70 levels 70 levels 100 levels 100 levels
Specialist 0.25km 0.25km 0.25km 0.25km 0.25km
100 levels 100 levels 100 levels 100 levels 100 levels
© Crown copyright Page 16
Summary
Main data link – adequate for current use
• Upgrade to Data dissemination (DART) complete (migration of service over next few months)
• Upgraded Internet connection - 30 to 100MBs-1
• Upgraded Link to ECMWF - 2 to 10MBs-1
• Plan for automatic, alternative route via Internet from NESDIS
• Testing of IPVPM replacement for RMDCN commencing
top related