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

2. Slide 2RMDCN 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. ECMWF Slide 3RMDCN 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. ECMWF Slide 4RMDCN 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. ECMWF Slide 5RMDCN 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. ECMWF Slide 6RMDCN 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. ECMWF Slide 7RMDCN Steering Group, 4-6 June 2008, Vienna Data dissemination (continued) Denmark: daily traffic Denmark: weekly traffic

8. ECMWF Slide 8RMDCN 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. ECMWF Slide 9RMDCN 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. ECMWF Slide 10RMDCN 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. ECMWF Slide 11RMDCN 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. ECMWF Slide 12RMDCN 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. ECMWF Slide 13RMDCN 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. ECMWF Slide 14RMDCN 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. ECMWF Slide 15RMDCN Steering Group, 4-6 June 2008, Vienna Summary Responses Site Current connectio n Future Connection SLA requirement RMDCN traffic Finland768 kbps1.5 MbpsHigh Availability France3Mbps20 MbpsHigh Availability / Mission Critical Germany2 Mbps10 MbpsHigh Availability / Mission Critical Hungary1 Mbps2 MbpsHigh Availability Italy2Mbps10 MbpsHigh Availability / Mission Critical Norway2 Mpbs24-100 MbpsHigh Availability Romania256 kbps1 MbpsHigh Availability Sweden3Mbps4 MbpsMission Critical UK2 Mbps27 MbpsHigh Availability / Mission Critical EUMETSAT2 Mbps12.5 MbpsMission Critical