Efficient architecture for large-scale video on demand storage server

Video-on-demand (VOD) system allows users to access media any time without the need to leave their home. Hard disk drive (HDD) has become popular for VOD storage to store and deal with a large amount of data. In practical cases, disk storage throughput is limited by a slow HDD and disk operating degrades drastically when the server needs to serve many simultaneous video streams. On the other hand, solid-state drive (SSD) are a appropriate features which does not has long access delay and support more IOPS that is greatly desirable for VOD storage. Unfortunately, using SSD to entirely replace HDD is not cost-effective. For this reason, hybrid storage is an economical way and offer better performance to treat with large scale VOD storage server. In this paper, SSD is divided into two different regions in size. The large part is used to store popular contents and the other is used as a buffer cache instead of RAM. The target of this research is to exploit fast access of SSD and its greater number of IOPS to maximize the number of simultaneously users and to minimize the service time. Experimental results of the proposed work enhance the response time for VOD storage server.