This document provides an introduction to grid computing and e-infrastructures. It discusses how grid computing allows users to access computing resources from different heterogeneous sources similar to how an electrical power grid provides power from various sources. It describes some examples of large-scale grids including the Large Hadron Collider and EGEE Grid. It also outlines some of the key components of grid infrastructure including middleware, virtual organizations, and applications.

1. Introduction to Grid computing and e-infrastructures Leandro N. Ciuffo <leandro.ciuffo@ct.infn.it> INFN – Catania (Italy) EELA-2 Application Support Manager Grid User Tutorial Kampala, 11.11.2009

2. 2 Computationally intensive research Kampala - Uganda, Grid User Tutorial, 11.11.2009

3. 3 Computationally intensive research Kampala - Uganda, Grid User Tutorial, 11.11.2009

5. LHC tunnel: 27 km circumference, 100m underground

6. 15 Petabytes of data per year (41TB per day)Kampala - Uganda, Grid User Tutorial, 11.11.2009

7. 5 wind coal hydroelectric nuclear The power Grid paradigm Electric Power Grid System Users can access electrical power coming from different (and heterogeneous) sources Kampala - Uganda, Grid User Tutorial, 11.11.2009

8. 6 The computing Grid approach Users can access storage and computing resources coming from different (and heterogeneous) sources Computing Grid System The resources shared within the Grid can be physical objects (CPUs, storage devices) or logical resources (computing queues, distributed file systems) Kampala - Uganda, Grid User Tutorial, 11.11.2009

9. Fourth EELA Workshop, Bogota, 05.03.2007 7 The Grid Metaphor Mobile Access G R I D M I D D L E W A R E Supercomputer, PC-Cluster Workstation Storage, Data from Sensors andinstruments Visualising

10. 8 e-Science Virtual Organisations e-Infrastructure Applications Data Instruments Kampala - Uganda, Grid User Tutorial, 11.11.2009

12. Heterogeneous resources, usually owned by diverse organizationsKampala - Uganda, Grid User Tutorial, 11.11.2009

13. The EGEE Grid EGEE numbers: >260 sites 54 countries ~150,000 CPUs >28 PetaBytes ~14,000 users ~200 VOs ~330,000 jobs/day

14. 11 The 1st Layer: The Global Network Kampala - Uganda, Grid User Tutorial, 11.11.2009

15. 12 SEE-Grid BalticGrid DEISA TeraGrid EGEE EUChinaGrid OSG NAREGI EUMedGrid EUIndiaGrid EUAsiaGrid EELA/ EELA-2 The 2nd Layer: The Global Grid SAGrid Kampala - Uganda, Grid User Tutorial, 11.11.2009

17. Currently :

18. 7 sites providing computing resources (storage, CPU), 5 in negotiation.

19. 2 sites provide core services (information index, workload management, medatada, file catalogue)

20. Project entails

21. Training and dissemination (collaboration with GILDA/INFN, EPIKH project)

22. Certificate Authority for accreditation to EUGridPMA under development

23. Interoperability is paramount to international collaboration. Close coordination with IGI (Italian National Grid) and INFN

25. Main website http://sagrid.ac.za

26. Support system : http://ops.sagrid.ac.za

27. Documentation, collaboration : http://wiki.sagrid.ac.za, http://docs.sagrid.ac.za

28. Events : http://indico.sagrid.ac.za

30. 16 Open Grid Forum http://www.ogf.org Kampala - Uganda, Grid User Tutorial, 11.11.2009

31. Middleware Software layer which fills the gap between users applications and distributed resources

33. UNICOREhttp://www.unicore.eu/

34. Condorhttp://www.cs.wisc.edu/condor/

35. ARChttp://www.nordugrid.org/middleware/

36. OurGridhttp://www.ourgrid.org

37. OGSA-DAI http://www.ogsadai.org.uk

38. gLitehttp://glite.web.cern.ch/glite/(…)

39. Kampala - Uganda, Grid User Tutorial, 11.11.2009 19 Component layers User’s applications Community services / APIs developed by users Core middleware services Operating system Network

41. What is the Grid? http://access.ncsa.uiuc.edu/witg/

42. iSGTW: What is a grid? A crash course in grid computinghttp://www.isgtw.org/?pid=1000550

43. Gridipediahttp://www.gridipedia.eu/aboutgrid.html

44. GILDA Wikihttps://grid.ct.infn.it/twiki/bin/view/GILDA

45. EELA-2 - self-traininghttp://applications.eu-eela.eu/self_training.php?l=50