Development of Resource Sharing System Components for AliEn Grid Infrastructure

<!--HTML-->The problem of the resource provision, sharing, accounting and use represents a principal issue in the contemporary scientific cyberinfrastructures. For example, collaborations in physics, astrophysics, Earth science, biology and medicine need to store huge amounts of data (of the order of several petabytes) as well as to conduct highly intensive computations. The appropriate computing and storage capacities cannot be ensured by one (even very large) research center. The modern approach to the solution of this problem suggests exploitation of computational and data storage facilities of the centers participating in collaborations. The most advanced implementation of this approach is based on Grid technologies, which enable effective work of the members of collaborations regardless of their geographical location. <br/> Currently there are several tens of Grid infrastructures deployed all over the world. The Grid infrastructures of CERN Large Hadron Collider experiments - ALICE, ATLAS, CMS, and LHCb which are exploited by specialists from five inhabited continents, are among the largest ones. <br/> A decade of extensive exploitation of Grid resources by various scientific communities has revealed the actuality of the following problems:<br/> - Need in an appropriate coordination of the resource usage and accounting for the resources. <br/> - Necessity of the increase of the computing and storage capacity of Grid by a seamless integration of external resources. <br/> - Minimization of the work of resource administrators on the maintenance and support of specific application software required by different scientific communities. <br/> - Need in a secure access to resources on the base of different authentication mechanisms. <br/> This dissertation is devoted to the solution of aforementioned problems within AliEn - the Grid infrastructure of ALICE experiment at CERN Large Hadron Collider.