A Multi-tier Asynchronous Architecture for Network Interactive Teaching System

In network interactive teaching system, Streaming media services are rich and powerful tool for delivering instruction content to online learners. However, sufficient quality of service (QoS) mechanisms must be in place before it can be widely enabled and deployed over the broadband Internet. If the capacity and efficiency of streaming server or network bandwidth is not sufficient for a lot of media files, the students have to wait the streaming media for a long time. So this paper tries to deal with VoD communication in streaming media system, and the focus is on evaluating and enhancing the performance of streaming media services. Our experiments have demonstrated that the Disk I/O will bear the brunt of one bottleneck of server, followed by the network bandwidth while the server delivers the movies. And those problems should be solved by good services from streaming media systems, so we present a multi-tier asynchronous architecture for streaming media systems. In such a system, streaming server sends performance log to database server periodically, and different contents are stored in different servers, on which we can ensure the normal operation of the streaming media services to provide a stable environment for users.