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RMDCN Requirements

RMDCN Requirements. Tony Bakker Network and Security Section ECMWF. Scope. Current use of RMDCN and other networks between ECMWF Member States and Co-operating States EUMETSAT Potential changes related to: Increase in model resolution Observing system New projects. Current situation.

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RMDCN Requirements

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  1. RMDCN Steering Group, 4-6 June 2008, Vienna RMDCN Requirements Tony Bakker Network and Security Section ECMWF

  2. RMDCN Steering Group, 4-6 June 2008, Vienna Scope • Current use of RMDCN and other networks between • ECMWF • Member States and Co-operating States • EUMETSAT • Potential changes related to: • Increase in model resolution • Observing system • New projects

  3. RMDCN Steering Group, 4-6 June 2008, Vienna Current situation • Main traffic patterns • Data dissemination • Data acquisition • Access to computing resources • Access to archived data • Network infrastructures used are • RMDCN • Leased line between UKMO and ECMWF • Internet • EUMETCast

  4. RMDCN Steering Group, 4-6 June 2008, Vienna Access to computing resources and archived data • Users from National Met Services can use both RMDC and Internet • Users from universities, research institutes, etc. can use the Internet only • Internet is the preferred choice for non-critical data transfers to • Avoid impact on operational traffic using the RMDCN • Take advantage of available Internet bandwidth • Although difficult to assess, the future requirements for network bandwidth are likely to grow with the increase in the size of data archive

  5. RMDCN Steering Group, 4-6 June 2008, Vienna Data acquisition • Entry point and first step of the data flow needed for the operational forecast production • Daily figures show that • 1.5 gigabytes received from UKMO (GTS + USA satellite data) • 2 gigabytes received from DWD (GTS + EUMETSAT satellite data) • 2.5 gigabytes received via Internet mainly from USA + very limited amount from Member States and Cooperating States • 20 gigabytes received via EUMETCast • RMDCN used for transfers from DWD only • Amount of data fairly constant in time increasing with the launch of new satellites and the availability of data from new instruments

  6. RMDCN Steering Group, 4-6 June 2008, Vienna Data dissemination • Characterised by an extremely large catalogue • Current total volume is 2.3 terabytes • Users can request tailored products • Large variety of products with very little overlap • User can control, at product level, the network used for transfers • Centred on two peak periods per day (00 and UT) each lasting 2 to 3 hours • In addition, products from BC project disseminated at 06 and 18 UT to the participating countries • Time or mission critical data sent over RMDCN or Leased Line while less critical data (e.g. backup/research data) transferred over the Internet

  7. RMDCN Steering Group, 4-6 June 2008, Vienna Data dissemination (continued) Denmark: daily traffic Denmark: weekly traffic

  8. RMDCN Steering Group, 4-6 June 2008, Vienna Data dissemination (continued) • RMDCN • Bandwidth varies between countries • “basic package” includes 768 kilobit/s IP bandwidth and 384 kilobit/s ISDN backup • Funded centrally for Member States • Co-operating States, EUMETSAT and other RMDCN countries fund their connection to the RMDCN • Countries are free to increase the available IP bandwidth out of their own budget according to their requirements • Appropriate dissemination channel chosen by each country according to own requirements • Some (e.g. Norway) increasingly use Internet to complement RMDCN • Others (e.g. France) rely exclusively on the RMDCN

  9. RMDCN Steering Group, 4-6 June 2008, Vienna Data dissemination (continued) • Over the last 8 years the volume of data transferred over RMDCN has increased by a factor of ~20

  10. RMDCN Steering Group, 4-6 June 2008, Vienna Upcoming changes • Evolution of model resolution • 2009/2010: increase from 25km x 25km and 91 vertical levels to 16km x 16km and ~130 vertical levels • Therefore, volume of data to be transferred will increase by a factor up to ~4 • The increase in data volume is expected not to become effective immediately • 2015: next resolution upgrade will multiply by ~4 the volume of data available for dissemination • New products, larger hindcast sets, etc will further increase the data volume

  11. RMDCN Steering Group, 4-6 June 2008, Vienna Upcoming changes (continued) • Data acquisition • Growth will continue to be strongly linked to satellites • METOP-B and NPP are expected to increase data volume by a factor of 5 to 10 • NOAA polar satellites (NPOESS), first in 2013, will require an increase in the networking capacity with UKMO by 15 • Expected daily amounts for the next 10 years are: • 22.5 gigabytes from UKMO • 10 gigabytes from DWD • 7.5 gigabytes via the Internet • 60 gigabytes via EUMETCast

  12. RMDCN Steering Group, 4-6 June 2008, Vienna Upcoming changes (continued) • Potential new projects • The number of Member State projects running at ECMWF are expected to continue to increase continuing the recent trend • Additional time-critical applications with their needs for both acquisition and dissemination of data may be implemented • New projects like GLAMEPS are aiming to use ECMWF as a central resource • All these activities will required improved networking facilities between ECMWF and MS/Co-op States

  13. RMDCN Steering Group, 4-6 June 2008, Vienna Questionnaire • Expected growth in following areas: • ECMWF dissemination data • Future service oriented architecture for ECMWF dissemination • Other ECMWF traffic requirements • GTS data • Other traffic • Envisaged new traffic

  14. RMDCN Steering Group, 4-6 June 2008, Vienna SLA Requirement • Mission Critical • Managed Network; Dual connection • High Availability • Managed Network; With backup (ISDN) • Standard • Managed Network; No backup • Best Effort • Internet like

  15. Summary Responses RMDCN Steering Group, 4-6 June 2008, Vienna

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