1. Project Partners Project Collaborators The Council for the Central Laboratory of the Research Councils Funded by EPSRC GR/T04465/01 www.eslea.uklight.ac.uk £1.1 M, 11.5 FTE

2. UKLight www.eslea.uklight.ac.uk

3. Capability Development  Control Plane Software  Protocol Development Exploitation  High Energy Physics: CDF, ATLAS  Radio Astronomy: VLBI  High Perf. Computing: RealityGrid  E-Health: Integrative Biology www.eslea.uklight.ac.uk (Started Feb 1 st 2005)

4. www.eslea.uklight.ac.uk Particle Physics

5. www.eslea.uklight.ac.uk RadioAstronomy

6. High Performance Computing

7. www.eslea.uklight.ac.uk E-Health

8. Summary ApplicationLinkFro m ToGb/sComments 46PaQ UCL-ChicagoULCCSL2*1.0 Looped at Chicago HEP: CDF UCL - FNALULCCSL1.0 HEP: ATLAS LAN - RALLANRAL0.5 HEP RAL - CERNRALNL2*1.0 VLBI JBO – DO JBO - Hstck MAN NL SL 1.0 RealityGrid UCL-MANULCCMAN1.0 UCL-TGULCCSL1.0 UCL-DLULCCLAN0.5 MAN-DLMANLAN0.5 MAN-TGMANSL0.5 DL-TGLANSL0.5 E-Health DL - RALLANRAL1.0 DL - MANLANMAN1.0

9. ESLEA eVLBI Objectives Demonstrate advantages of VLBI data transport on UKLight over that available via production networks by April 2006 Formulate methodologies for optimum use of switched light paths for VLBI by Jan 2007 Help bring eVLBI to the user, April 2007(in conjunction with EXPress)

10. UKLight Switched light path

11. UDP Performance: 3 Flows on GÉANT Throughput: 5 Hour run 1500 byte MTU Jodrell: JIVE 2.0 GHz dual Xeon – 2.4 GHz dual Xeon 670-840 Mbit/s Medicina (Bologna): JIVE 800 MHz PIII – Mk5 (623) 1.2 GHz PIII 330 Mbit/s limited by sending PC Torun: JIVE 2.4 GHz dual Xeon – Mk5 (575) 1.2 GHz PIII 245-325 Mbit/s limited by security policing (>600Mbit/s  20 Mbit/s) ? Throughput: 50 min period  Period is ~17 min

12. Jodrell Bank UK Dwingeloo DWDM link Medicina Italy Torun Poland e-VLBI at the GÉANT2 Launch Jun 2005

13. 18 Hour Flows on UKLight Jodrell – JIVE, 26 June 2005 Throughput: Jodrell: JIVE 2.4 GHz dual Xeon – 2.4 GHz dual Xeon 960-980 Mbit/s Traffic through SURFnet Packet Loss –Only 3 groups with 10-150 lost packets each –No packets lost the rest of the time Packet re-ordering –None

14. What’s next at JBO/Man: Routine eVLBI tests (PB) continue ESLEA: –Report on European connectivity and use of UKLight –Report on connectivity to US (Haystack) Tests: –More using UDP-vlbi (JBO, Bologna, Torun, UKLight vs production JBO-JIVE) –SC 2005, UKLight connections to Haystack –Higher spec motherboards? –DCCP tests (2006) Simon: –Disk data transfer in UDP-vlbi –Characterize internet weather? –Effect of packet loss on correlator performance EXPress

15. Conclusion and Future directions ESLEA project well underway. VLBI part is meeting milestones, Matt Strong (PDRA) just appointed. G2 launch showed continuous long term flows as in VLBI have different characteristics to those in short term tests (Iperf, UDPmon) : more investigation needed – collaborating with DANTE and SURFnet Packet loss is a killer for TCP – new protocols needed (ESLEA – DCCP, VSI-E? The End Host Problem – limits performance –The performance of Motherboards, NICs, RAID controllers and Disks matter: Mk V units??? New ESLEA objective: 512 Mbps in 2006? MkV-B 2 Gbps data recording in 2 yrs ? Next generation correlator 10 Gbps in 5-10 yrs??

16. Thanks to Richard Hughes-Jones HEP Manchester Paul Burgess, Simon Casey JBO Steve Parsley, Arpad Szomoru, Cormac Reynolds JIVE Colin Greenwood, Nicola Pezzi, John Graham, Peter Clarke ESLEA EVN observatories staff