Some Key Technologies For Resource Management And Data Transfer Scheme In Optical Grid

The stable network is one of the key technologies to provide the reliable service in grid computing. The comunications service in traditional grid computing is based on Internet, but with the development of technologies, some inherent shortcomings in the Internet gradually are exposed. Exspecially, it is vital for the bulk-data transfer whether to be able to provide the fast, dynamic and reliable data transfer. The recently rapid development of optical communication technologies creates the chance to resolve the problems. Undoubtedly, optical network with high the ratio of performance to cost becomes the best choice to construct the grd network. If optical network is regarded as a network resource shared among the grid users, it is essential to resreach the definition of optical network resource, how to encapsulate them into services and manage the services. Many research organizations in the world have started the research work about them. The results of these research works is generally called as optical grid.Constructing the optical grid will involve a lot of key theories and technologies, such as resource management theory, relevant algorithms of some operations of resource management, the algorithms about load allocation, data transmission, and so on. The dissertation lucubrates about the aboved problems. Based on the study of the essential conception, characteristics and architechture of optical grid, the author researches the problems of resource management, resource co-scheduling to combine network resources with application resources, load allocation based on load balance and DLT, multi-path transmission based upon GridFTP. Moreover, the author takes apart in designing and contructing of the optical grid testbed. Some of new schemes and techniques are validated by the experiments carried out in the testbed.This thesis is divided into three parts: (1) the systematic research on the essential conceptions and characteristicses of optical grid and its architecture and functional requirements, (2) the research on key technologies including the resource management, resource scheduling, load allocation based on load balance and dividable load theory, multi-path data transmission based on GridFTP etc., (3) the sum-up of the aboved content and the expectation to research all kind of technologies further in the future.The main innovations can be summarized as follows:(1) Due to the characters of optical grid, two resource co-scheduling algorithms combining network resources with application resources are proposed: best path algorithm, it schedules the application resources in the optical grid system by optimizing the communication resources used for the grid application, to minimze the cost of path between source node and destination node; minimum cost algorithm, it starts from optimizing the cost of excuting the job and integrates network resource with application resource to select the resources to finish the grid task. It is a compromise about best resource algorithm and best path algorithm.(2) Load balance and divisable load theory are introduced to load allocation in optical grid, and multi-round load balance approach is proposed. Based on it, multi-round adaptive algorithm for refining the tuning factor is proposed. The algorithm is for load allocation in optical grid. The simulation results show that it can balance the load accounts allocated in each of grid resource nodes, and it can obviously improve the time spending and then get better performance.(3) A novel multi-path transmission scheme based on GridFTP is proposed. This scheme can improve the excuting time of grid task. The outstanding performance together with better parallel dealing character when transporting the bulk-data makes it a very attractive candidate for use in practice.(4) The functional experimentations of bulk-data transmission in optical gird are made on the developed test-bed. The superiority and applicability of the proposed schemes and implementation approaches are validated by the experimentations, and results of the experimentations are consistent with theoretical researches.