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20 th North America-Europe Data Exchange Meeting 22-24 May 2007, Darmstadt

20 th North America-Europe Data Exchange Meeting 22-24 May 2007, Darmstadt. David Hennings, Met Office. Datalinks Message switching systems WMO/GTS (Frost) File Transfer (Netlink → DART) Dedicated link data Volumes Supercomputer/Model. Telecommunication Links Status Report.

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20 th North America-Europe Data Exchange Meeting 22-24 May 2007, Darmstadt

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

  2. Datalinks • Message switching systems • WMO/GTS (Frost) • File Transfer (Netlink → DART) • Dedicated link data Volumes • Supercomputer/Model Telecommunication Links Status Report

  3. Main Communications Links from Exeter,… and changes

  4. Message Switching Systems - Frost

  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

  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

  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.

  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

  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)

  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

  11. Present Data Volumes on Washington NOAA (NESDIS) Link

  12. Present Data Volumes on Washington NOAA (NESDIS) Link

  13. Netlink data: NOAA - (NESDIS) Suitland Yearly (1 Day Average)

  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. Theoretical peak power of 16 billion calculations per second per processor See http://www.metoffice.gov.uk/corporate/pressoffice/2005/pr20050412.html

  15. SuperComputer Changes

  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

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