Statistical admission control in video servers with variable bit rate streams and constant time length retrieval

We consider the admission control problem in video servers for the retrieval of media data from disk storage. We assume that the I/O bandwidth of the server disk is limited. Given a certain I/O bandwidth, admission control decides whether or not a new client can be accepted without affecting the quality of service promised to the already admitted clients. Assuming variable bit rate (VBR) video streams, we consider an admission control policy with both, deterministic and statistical service guarantees for constant time length retrieval (CTL) and evaluate its performance in terms of the number of clients admitted.