Division-based Video Data Access Method for Hot/Cold Tiered Storage Systems

摘要

Due to the recent prevalence of video-on-demand services, data centers for them store a large number of video files,and some data centers adopt hot/cold tiered storage systems. Hot/cold tiered storage systems achieve a low power consumptionand low monetary cost because some data are stored in cold storage, of which the price per data unit is lower than that of hotstorage. One of their drawbacks is the slow data access speeds of cold storage. This is a very large problem for video-on-demandservices since long interruption times for video playback occur when clients do not receive each video data segment by the timeto play it. However, conventional hot/cold tiered storage systems are designed for general services and lack the possibility tofurther reduce total playback interruption times for video-on-demand services. In this paper, we design a novel data accessmethod for video-on-demand services using hot/cold tiered storage systems. In our method, each video file is divided into videofile segments so that the clients can finish receiving subsequent segments while playing received segments. By storing the firstsegment into the hot storage and the others into the cold storage, our method achieves a lower power consumption and lowermonetary cost while reducing total playback interruption times.