A NEW STORAGE ARCHITECTURE FOR A FLASH-MEMORY VIDEO SERVER

Sungchae Lim

Abstract: During the past decade, there has been drastic growth in network traffics that are made from online views on video content in Internet. Owing to current high popularities of video streaming services such as YouTube, Netflix and portals’ UCC, such a trend is likely to be continuing in the next decade as well. For the successful proliferation of streaming services in the future, it is important to develop high-performance video servers that can fulfil bandwidth requirements of concurrently served video streams in a cost-effective way. To this end, we propose a video storage architecture using the SSD (solid state drive) as a cache layer. Since the SSD storage provides fast and uniform speed of random reads, it can work well with the EDF algorithm. To employ the EDF algorithm, the system time is divided into cycles and the bandwidth allocation is done by considering the scheduling periods and the number of flash blocks retrieved for serviced video streams. Since the bandwidth allocations of serviced video streams are managed within a full capacity of the scheduled SSD bandwidth, we can efficiently prevent undesirable hiccups of serviced video streams

Keywords: Video streaming service, flash memory, real-time scheduling, data caching, admission control

DOI: https://doi.org/10.15623/ijret.2015.0412021