Ogsa And Web-based Vod System Research And Design

Nowadays ,Grid becomes an important information technology in the world ,which aims to realize high performance resource sharing and cooperation and to eliminate information and resource island. OGSA(Open Grid Services Architecture) that is called the next generation Grid architecture is a distributed architecture frame on the base of Grid Service. OGSA gives emphasis to location transparency and multiple protocol bindings for service instances, supports integration with underlying native platform facilities.This paper makes an introduction about Grid concept, current grid research status, grid architecture, then studies the de facto grid specification-OGSA (Open Grid Service Architecture) and grid computing platform specification-Globus Tookit 3.0.There is much limitation in current video on demand systems , which aren't integrated with each other and have bad extendibility . In the light of the limitation , a on line video on demand system is put forward based on OGSA through combining grid's open and standard unified feature, and OGSA's service - centred feature. It has well compatibility and extendibility, and easy to extend and upgrade systems.Program shared and managing platform is to construct a series of new program services platform.for conquering some limitations in program services on video on demand systems .It also can build better interaction between program provider ,spectators and operators .This platform provides a series of tools which can complete uploading ,searching and managing programs ,and distributing jobs between departments.