A Study Of GOS Grid File System In A Computational Grid Environment

In order to share computer resources which distribute in different locations and use idle CPU or storage space and other resources, we put forward the concept of grid. It is hoped that we can easy access to the grid platform, a variety of resources such as computing resources, storage resources, scientific instruments, etc. because grid platform is decentralized, heterogeneous, when the input and output data that grid computing services needed are not in the same node, We need data management and delivery platform to support this situation. In a computational Grid environment comprised of grid nodes and domain-specific applications, because of user authentication in the internal grid nodes and the restrictions of access control mechanism in the communities, the lack of an effective unified way to access the file of grid node is very inconvenience for grid user. In the GOS environment,an effective management and access mechanisms is needed for grid file, achieving optimal resource integration and convenience to use for user.In this paper, at the basis of China National Grid System Software GOS grid environment, designed and implemented a complete set of grid file system. This thesis has studied the following questions: Firstly, the problem of file and path-access expression, a particular logic tree has been raised, and all physical files can be accessed through the logic tree node. Secondly, the problems of resources dynamic deployment and mounting have been studied. In the grid system GOS, the concept of Mount-Point have been introduced into the system and completed the dynamic deployment of node file system. Mount point is a node of information that contains meta-information. It was spread to all gird node by Naming mechanism, so users can access it at their own node. Thirdly, the problem of Reliable File Transfer have been studied, open-source framework Quartz have been introduced into grid file transfer scheduling management. It watch the states of file transfer and start to retransmission when there is an error been recorded, ensuring the tasks of file transmission is reliant. Through many testing and using, GOS grid file system has been successfully integrated into the GOS and provided an effective file access solution.