Computer architecture: a quantitative approach
Computer architecture: a quantitative approach
Designing file systems for digital video and audio
SOSP '91 Proceedings of the thirteenth ACM symposium on Operating systems principles
A generalized interval caching policy for mixed interactive and long video workloads
Readings in multimedia computing and networking
Delay-Sensitive Multimedia on Disks
IEEE MultiMedia
Making a Cost-Effective Video Server
IEEE MultiMedia
Cost Analyses for VBR Video Servers
IEEE MultiMedia
Efficient Storage Techniques for Digital Continuous Multimedia
IEEE Transactions on Knowledge and Data Engineering
A Low-Cost Storage Server for Movie on Demand Databases
VLDB '94 Proceedings of the 20th International Conference on Very Large Data Bases
Optimizing the Placement of Multimedia Objects on Disk Array
ICMCS '95 Proceedings of the International Conference on Multimedia Computing and Systems
Constant Data Length Retrieval for Video Servers with Variable Bit Rate Streams
ICMCS '96 Proceedings of the 1996 International Conference on Multimedia Computing and Systems
Algorithms for designing multimedia servers
Computer Communications
Multimedia file systems survey: approaches for continuous media disk scheduling
Computer Communications
A Replication Strategy for Reducing Wait Time in Video-On-Demand Systems
Multimedia Tools and Applications
| Hi-index | 0.00 |
The release of DVD-ROMs (Digital Versatile Disk—Read Only Memory), capable of storing an entire 133 minute MPEG-2 movie, coupled withthe gradual deployment of high speed networks will give a much neededimpetus to Video-on-Demand systems, especially movie-on-demandservices. Various memory components such as DVD-ROMs, magnetic RAIDtowers, and RAM are available, each with different storage andbandwidth capabilities, and each with different costs. To design avideo server, we need to optimize the cost factor, yet meet themassive storage, high bandwidth and continuity requirements of videostream delivery.In the first part of this paper we compare DVD-ROM and RAID systemson the basis of two factors—a storage factor and a bandwidthfactor. We work out relations to calculate capacity requirements andcosts, of these systems given the demands of video delivery. We thenpropose an architecture for a video server where we deploy threelayers of memory functioning as video pumps: DVD-ROM towers, RAIDtowers, and RAM. We then work out expressions to determine themigration strategy of a movie between these layers of storage so asto optimize on the cost of storage while satisfying the performancerequirements. We then show the method by which the amount of storagerequired for each type of memory in the three layers can be fixed,knowing the usage pattern.In the second part of the paper, we discuss the implementation of avideo pump where there is a need to integrate scheduling, admissioncontrol, VBR stream management, and handling of VCR-like requestssuch as fast-forward, fast-reverse and pause. We first work outgeneral relations for calculation of the service time of a requestknowing the seek overheads and playback rates. We then show that,surprisingly, the C-SCAN algorithm, which incurs the least amount ofseek overhead and therefore has a lesser cycle time, is twice asefficient as SCAN in terms of buffer space requirements. We thenpropose a ’full-load‘ admission control and scheduling algorithmthat operates on a constant cycle time basis. We test the validity ofthis scheme though a the simulator which we have built based on ourdisk model and use it to extract parameters such as disk bandwidthutilization factor and buffer sizes needed for a VBR load scenario.