The Design And Implementation Of Virtual Organization Subsystem In Grid Environment

In the Grid environment, resources are collaboratively shared in the form of Virtual Organization (VO), which is a dynamic collection of distributed resources and individuals, defined according to a set of resource sharing rules. How to facilitate the construction of VOs to meet the resource sharing requirement of certain application is the key issue of Grid Service System.The Virtual Organization Subsystem (VOS) discussed in this dissertation is an exploratory practice of VO's construction and management in High Performance Computing Environment (HPCE). Through abstracting the resource's heterogeneous features and the complex links that lie in the HPCE's current resources sharing status, the resource sharing problems in HPCE are transformed into resource sharing among VO members. On this basis, by defining the VO's basic strategies, a resource management mechanism is created, which consists of virtual organization, management domain, grid services, resource owners. In conformity with the strategies and resource management mechanism, the VOS' design adopts the modularization pattern and emphasizes the software hierarchy, according to which the VOS is divided into four layers: Portal Layer, Web Service Layer, Logic Function Layer, and Data Persistence Layer. During the implementation, RBAC, Object/Relation Tool, Axis's Handler-Chain, SSL are used to achieve reliable resources sharing and ensure the security of internal communication, Depth-First Search in the Connected Graph is adopted to avoid the confusion in the course of VO Member's identity transformation, and in addition the RIA technology is employed to supply a friendly portal for grid users.At the end of the dissertation, the VOS is tested by JMeter.The testing data indicates that the subsystem owns the ability to meet current concurrent accessing demand of HPCE.