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LHC Computer Grid - Rollout > [mailto:[log in to unmask]] On Behalf Of Ben Waugh said: > I don't think it was the intention that every T2 site would have to > provide infinite amounts of permanent storage, and I don't > think many T2 > sites will be able to do this. If this means that our processing power > will remain unused, then there seems little point in having a > second tier at all. It might be interesting to look at the RTAG 6 report: http://lcg.web.cern.ch/LCG/sc2/RTAG6/finalreport.doc although it isn't very specific. It suggests: 3.2.2 Tier2 § CPU cycles (Grid enabled computing elements) § Disk storage, maybe temporary only (Grid enabled storage elements) § May have mass storage § Sufficient network bandwidth for inter-operability § A weaker commitment to provide access to data over LHC lifetime § A weaker commitment to provide long-term access to specific analysis data § A weaker commitment to resource upgrades § Focused user support § 24/7 service but with no guaranteed short-time "crash" response Stephen