1. Page 1© Crown copyright 20 th North America-Europe Data Exchange Meeting 22-24 May 2007, Darmstadt David Hennings, Met Office

2. 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

3. Page 3© Crown copyright Main Communications Links from Exeter, … and changes

4. Page 4© Crown copyright Message Switching Systems - Frost

5. Page 5© Crown copyright 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

6. Page 6© Crown copyright 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

7. Page 7© Crown copyright 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.

8. Page 8© Crown copyright 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

9. Page 9© Crown copyright 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)

10. Page 10© Crown copyright 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

11. Page 11© Crown copyright Data TypePlatform File headerMB /day (prev) Files AMSU-A Level 1BNOAA-ATOVS nss.amax130 (115) 28 AMSU-B Level 1BNOAA-ATOVS nss.ambx283 (301) 41 HIRS Level 1BNOAA-ATOVS nss.hirx294 (255) 68 MHS Microwave Humidity SounderNOAA-ATOVS nss.mhsx194 (100) 28 HIRS Level 1B (AVHRR mapped to HIRS grid)NOAA-ATOVS npr.atav94 (66) 41 NCEP SST derived from AVHRR (100Km)NOAA-ATOVS prd.sst.field>2 (1) 1 QuikScat Seawinds scatterometer dataNASA/JPL npr.qbuf215 (216) 28 AIRS Brightness temperaturesNASA –EOS-2 (Aqua) npr.aibt261 (569) 223 AMSU-A Brightness temperaturesNASA –EOS-2 (Aqua) npr.aubt11 (12) 231 SSM/I Brightness temperaturesDSMP npr.sdrr240 (227) 43 SSMIS Level 1cDSMP npr.td{E,I,L,U}b352 (295) 62 Ozone, retrieved profiles and/or total column from SBUV DSMP prd.ozone.pmf5 (1) 82 Total (wef 30 April 2007) 2081 (2158) 916 Present Data Volumes on Washington NOAA (NESDIS) Link

12. Page 12© Crown copyright Present Data Volumes on Washington NOAA (NESDIS) Link

13. Page 13© Crown copyright Netlink data: NOAA - (NESDIS) Suitland Daily (5 Minute Average) Yearly (1 Day Average)

14. Page 14© Crown copyright 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

15. Page 15© Crown copyright SuperComputer Changes ModelNow20092010201120122013 Global40km 25km 18km 50 levels* (*Dec 20070 70 levels 100 levels N At Eur12km8km 5km 50 levels70 levels 100 levels UK4km1.5km ~0.8km 50 levels70 levels 100 levels Specialist 0.25km 100 levels

16. Page 16© Crown copyright 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