Storage systems for movies-on-demand video servers

Proceedings of IEEE 14th Symposium on Mass Storage Systems Pub Date : 1995-09-11 DOI:10.1109/MASS.1995.528234

A. Chervenak, D. Patterson, R. Katz

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引用次数: 22

Abstract

We evaluate storage system alternatives for movies-on-demand video servers. We begin by characterizing the movies-on-demand workload. We briefly discuss performance in disk arrays. First, we study disk farms in which one movie is stored per disk. This is a simple scheme, but it wastes substantial disk bandwidth, because disks holding less popular movies are underutilized; also, good performance requires that movies be replicated to reflect the user request pattern. Next, we examine disk farms in which movies are striped across disks, and find that striped video servers offer nearly full utilization of the disks by achieving better load balancing. For the remainder of the paper, we concentrate on tertiary storage systems. We evaluate the use of storage hierarchies for video service. These hierarchies include a tertiary library along with a disk farm. We examine both magnetic tape libraries and optical disk jukeboxes. We show that, unfortunately, the performance of neither tertiary system performs adequately as part of a storage hierarchy to service the predicted distribution of movie accesses. We suggest changes to tertiary libraries that would make them better-suited to these applications.

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用于电影点播视频服务器的存储系统

我们评估了电影点播视频服务器的存储系统替代方案。我们从描述电影点播工作量开始。我们将简要讨论磁盘阵列的性能。首先，我们研究每个磁盘存储一部电影的磁盘场。这是一个简单的方案，但是它浪费了大量的磁盘带宽，因为保存不太受欢迎的电影的磁盘没有得到充分利用;此外，良好的性能要求复制影片以反映用户请求模式。接下来，我们将检查磁盘场，其中电影在磁盘上分条显示，并发现分条显示的视频服务器通过实现更好的负载平衡，几乎可以充分利用磁盘。对于本文的其余部分，我们将集中讨论三级存储系统。我们评估了视频服务中存储层次结构的使用。这些层次结构包括一个三级库和一个磁盘场。我们考察了磁带库和光盘自动点唱机。不幸的是，我们表明，作为存储层次结构的一部分，这两个三级系统的性能都不能充分地服务于预测的电影访问分布。我们建议对三级库进行更改，使其更适合这些应用程序。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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Proceedings of IEEE 14th Symposium on Mass Storage Systems

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