Abstract
One of the most important goals of VOD servers is to provide maximum users with retrieval services concurrently. To approach the goal, it is necessary to use an efficient storage strategy that can place video objects on the storage media efficiently and retrieve them more rapidly. However, occasionally, to emphasis retrieval efficiency makes reliability insufficient. On VOD server, trivial errors may be ignored, however, some fatal errors may damage systems. Therefore, it is necessary for storage servers to manage parity information like RAID.In this paper, we propose a new storage strategy to provide both higher retrieval efficiency and reliability. In particular, our strategy is designed to fully utilize the I/O bandwidth of disks and characteristics of video objects to be stored, so that it provides high retrieval performance. In addition, it has an efficient architecture of storage system to be apt to manage parity information. Lastly, we simulate our strategy and conventional strategies through various experiments and evaluate the number of supportable video streams. In these experiments, we show the results that our strategy performs better than others do.