Scrap: Data Reorganization and Placement of Two Dimensional Scalable Video in a Disk Array-Based Video Server

In this paper, we propose an efficient data reorgani- zation and placement for two dimensional scalable video in a disk array-based video server. In the scalable video coding (SVC), multi-dimensional scalability aspects are implemented, accordingly, all types of these scalability can be exploited at the same time. However, its flexibility would make a non contiguous retrieval of partial stream data, which degrade disk performance greatly. We note that in a disk array the video data can be split into several discontinuous sub-streams by the striping manner of disk array. In view of this, we reorganize sub-streams taking into account both of the decoding dependency of two dimensional scalable video and the location in a disk array. It is shown that the advantages of our placement include: minimizing the seek frequency while maximizing utilization of each disk, maximizing the load balancing and parallelism of disk array. The experimental results show that the proposed reorganization and placement of two dimensional scalable video can significantly improve the performance of video server. keywords - Sclable Video Coding, Unit Sub-stream, Disk Array