(毕业论文 页数:11 字数:6546 英文翻译)概述:高速发展高速的网络和多媒体技术,使我们能够为用户提供VOD服务。不过,它仍是一个艰巨的任务,制定具有成本效益的VOD系统,可支持大量用户(每个人可能有不同的服务质量的要求),同时提供不同类型的录像机的功能。虽然已经认识到录像机业务的重要功能,提供VOD服务、技术建议为过去录像机业务系统可能需要额外的资源,例如额外的外盘I/O、具有更多的缓冲空间以及网络带宽。 在这篇文章中我们考虑设计一个VOD存储服务器让它具有下列特点:(一)提供不同层次的用户所需要的不同的服务质量要求,(二)提供不同类型的录像机功能,如快速推进,倒退,不附加任何额外的系统缓冲的空间,I/O带宽、网络带宽。(三)保证的负载平衡和所有录像机时间显示正常。 上述特点尤为重要,因为这些简化设计的缓冲空间,I/O、网络资源分配政策VOD存储系统。 负载平衡也确保任何一个磁盘系统正常工作的瓶颈。 在这份文件中,建议将数据堵塞、录取控制,I/O安排算法,以及确定相应的缓冲空间需要存储系统的建议VOD。 我们显示系统能够提供建议VOD录像机、多服务,解决客户观看,同时保持负载平衡。 Abstract. Advances in high-speed networks and multimedia technologies have made it feasible to provide video-ondemand (VOD) services to users. However, it is still a challenging task to design a cost-effective VOD system that can support a large number of clients (who may have different quality of service (QoS) requirements) and, at the same time, provide different types of VCR functionalities. Although it has been recognized that VCR operations are important functionalities in providing VOD service, techniques proposed in the past for providing VCR operations may require additional system resources, such as extra disk I/O, additional buffer space, as well as network bandwidth. In this paper, we consider the design of a VOD storage server that has the following features: (1) provision of different levels of display resolutions to users who have different QoS requirements, (2) provision of different types of VCR functionalities, such as fast forward and rewind, without imposing additional demand on the system buffer space, I/O bandwidth, and network bandwidth, and (3) guarantees of the load-balancing property across all disks during normal and VCR display periods. The above-mentioned features are especially important because they simplify the design of the buffer space, I/O, and network resource allocation policies of the VOD storage system. The load-balancing property also ensures that no single disk will be the bottleneck of the system. In this paper, we propose data block placement, admission control, and I/O-scheduling algorithms, as well as determine the corresponding buffer space requirements of the proposed VOD storage system. We show that the proposed VOD system can provide VCR and multi-resolution services to the viewing clients and at the same time maintain the load-balancing property.
目录 1。介绍 1。介绍 |
在多协议VOD系统中有效支持交互式服务
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