Career: The Personal Terabyte Disk: Managing and Exploiting Large Future Magnetic Disks

预计在至少十年内，磁盘驱动器的容量将以每年超过50%的速度增加，而价格将以每年超过50%的速度下降。到2010年，个人电脑1 TB的磁盘存储成本将达到几百美元。Personal Terabyte Project正在开发一套管理和利用这一大型个人数据存储库的工具。为了保证个人TB级数据的可靠性，将采用包括压缩、增量备份和基本数据的选择性备份在内的备份技术以及磁盘阵列冗余技术。未来的家庭将有各种各样的网络连接，从高带宽、廉价的广播连接到成本较高、带宽较低的点对点链路。个人TB将缓存到达广播网络的相关数据，并通过点对点、按需连接积极地预取额外数据。由于数据存储在个人TB上，该工具包将对文本、图像和视频进行自动索引，以便于在海量文件系统上查找数据。为了解决内存和磁盘访问时间之间的差距，该工具包将从磁盘预取数据到主内存。最后，为了提高应用程序性能，该工具包将促进本地和远程进程之间共享磁盘缓存。*

Magnetic disk drives are expected to increase in capacity and drop in price at a rate of over 50% per year for at least a decade. By 2010, a terabyte of magnetic disk storage for personal computers will cost a few hundred dollars. The Personal Terabyte Project is developing a set of tools for managing and exploiting this large personal data repository. To guarantee reliability of personal terabyte data, backup techniques including compression, incremental backups, and selective backups of essential data will be implemented, as will disk array redundancy techniques. Future homes will have a variety of network connections, from high-bandwidth, inexpensive broadcast connections to higher-cost, lower-bandwidth point-to-point links. The personal terabyte will cache relevant data that arrives on broadcast networks and aggressively prefetch additional data over point-to-point, on-demand connections. As data are stored on the personal terabyte, the toolkit will perform automatic indexing of text, images and video to facilitate finding data on the massive file system. To address the gap between memory and disk access times, the toolkit will prefetch data from disk to main memory. Finally, to improve application performance, the toolkit will facilitate sharing of the disk cache among local and remote processes.***