Research on Layered Resource Discovery Model in Grid

Grid aims at sharing all kinds of geographically distributed and heterogeneous resources. The key to resource organization is how to accomplish the resource discovery efficiently. In this paper, a Layered Resource Discovery Model (LRDM) was proposed firstly according to different resource type in grid. Then the components of LRDM were analyzed and designed in detail with resource discovery module in Globus Tookit 4, mainly including resource description, resource information storage, resource information organization, resource request processing, and resource selection. Finally, the model was implemented and proved to have the characteristics high discovery efficiency and scalability because of combining the advantages of both centralized and distributed mechanisms.