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ScotGrid is a distributed Tier-2 centre in the UK with sites in Durham,Edinburgh and Glasgow. ScotGrid has undergone a huge expansion in hardware inanticipation of the LHC and now provides more than 4MSI2K and 500TB to the LHCVOs. Scaling up to this level of provision has brought many challenges to theTier-2 and we show in this paper how we have adopted new methods of organisingthe centres, from fabric management and monitoring to remote management ofsites to management and operational procedures, to meet these challenges. Wedescribe how we have coped with different operational models at the sites,where Glagsow and Durham sites are managed "in house" but resources atEdinburgh are managed as a central university resource. This required theadoption of a different fabric management model at Edinburgh and a specialengagement with the cluster managers. Challenges arose from the different jobmodels of local and grid submission that required special attention to resolve.We show how ScotGrid has successfully provided an infrastructure for ATLAS andLHCb Monte Carlo production. Special attention has been paid to ensuring thatuser analysis functions efficiently, which has required optimisation of localstorage and networking to cope with the demands of user analysis. Finally,although these Tier-2 resources are pledged to the whole VO, we haveestablished close links with our local physics user communities as being thebest way to ensure that the Tier-2 functions effectively as a part of the LHCgrid computing framework..

ScotGrid: Providing an Effective Distributed Tier-2 in the LHC Era