Grid Networking issues Pascale.Primet@inria.fr INRIA-RESO http://www.ens-lyon.fr/LIP/RESO

Lessons High Speed networks: WAN, LAN, SAN: optical, Gigabit Ethernet enable high performance distributed computing system creation. The Networking functionality is available everywhere due to IP technology but it seems we discover that “the network cloud» is a shared uncontrolled resource. Issues! Performance, flexibility, security, heterogeneity… =>end to end issues =>user level perspective P.VICAT-BLANC/PRIMET

Classify the issues functional issues => long term research: what grid user would like to do but cannot because the service does’nt exists(ex: API for e2e bandwidth reservation) conceptual issues => medium term research the service exists but does not behave correctly or is not designed for grid context Adapt to grid context, find appropriate parameters operational issues => engineering issues grid user have to care on hardware and implementation details if they want to obtain the available service. How to solve such technical issues at large scale? P.VICAT-BLANC/PRIMET

Eg. Issues in Transport GGF GHPN document Problems due to the applications Problems related to the end system Problems related to the TCP configuration Problems related to the TCP protocol Problems related to the network (SAN, LAN, access, core…) GGF Data Transport Research Group “Survey on Transport protocols other than TCP” GGF GHPN document Networking Issues of Grid Infrastructures http://www.ggf.org/ PFLDnet 2003 and 2004 workshop: http://www.datatag.org/pfldnet2003/ DataTAG played a very important role. P.VICAT-BLANC/PRIMET

Perspectives Do we want shared networks or not? => deterministic path? With whom do we want to share them? How do we want to share them - inter-fairness - intra-fairness… Do we want the Grid apps really use this resource? What do we do for this? (remember the ATM story and APIs…!) We have to see the Grid as a whole complex system A long term process to tune it… P.VICAT-BLANC/PRIMET