1. Henri Bal Vrije Universiteit Amsterdam vrije Universiteit

2. DAS-2: homogeneous Computer Science grid +“A grid that works’’ +Ideal for clean measurements -Bad for heterogeneous or long-latency experiments GridLab: ad-hoc testbed for one EC project +Useful for heterogeneous experiments -Small-scale, unstable Grid’5000: large-scale French CS grid +Excellent for large-scale experiments -Bad connectivity to outside world (DAS-2) Our Grid Adventures on DAS-2, GridLab and Grid'5000

3. Are experimental Grid platforms useful?  Some DAS-2 (2002-2006) statistics: 1 M€ investment (5 Myrinet clusters, 200 nodes) > 200 users from many universities, 25 Ph.D. theses Major incentive for VL-e (Virtual Laboratory for e-Science) initiative  20 M€ government funding -VL-e was major incentive for Big-Grid (~ 30 M€) Funding for DAS-3 (Aug. 2006) Collaboration DAS-3 /SURFnet: 80 Gbs optical network Collaboration with Grid’5000: towards a European scale => DAS has a major impact on Dutch computer science

4. What is the experimental scope? Essential to distinguish between: -Experimental grids for Computer Scientists -Proof of concept environments for application scientists -Production grids (with massive data storage) In plain Dutch: DAS / VL-e PoC / Big-Grid Computer Science grids are needed to: -Do clean experiments with reproducible results -Optimize utilization degree -Be able to change everything (OS, network protocols) < 20%

5. Is there room for an international testbed? Need large-scale systems -E.g., for research on P2P computing, algorithms, programming systems, communication protocols, etc. There are many collaborations that may boost an international testbed -NL: ASCI school  DAS-1, DAS-2, DAS-3 -EU: CoreGRID NoE  …..