High-Performance File Systems

Delta文件系统是一种高性能的Unix文件系统设计，它使用线程日志支持操作系统和数据库语义。日志只记录元信息的变化；文件块的处理方式与传统的Unix文件系统一样。日志支持在操作系统级别实现原子性，同时提高常见文件系统操作的性能，例如文件的创建和删除。线程日志支持非常精细的锁定粒度。本研究包括为Unix构建一个新的高性能文件系统，并在性能、设备独立性和容错性三个相关领域进行权衡研究。这需要设计和实现新的文件系统算法，测量它们的性能和文件系统的属性，并澄清不同技术之间的权衡。

The Delta File System is a high-performance Unix file system design which supports both operating systems and database semantics using a threaded log. The log records only meta information changes; file blocks are handled as in traditional Unix file systems. The log enables implementation of atomicity at the operating system level while increasing the performance of common file system operations, such as the creation and deletion of files. A threaded log enables very fine granularity of locking. The research consists of constructing a new high- performance file system for Unix, and investigating the tradeoffs in three related areas, performance, device independence, and fault tolerance. This entails designing and implementing new file system algorithms, measuring their performance and the properties of file systems, and clarifying the tradeoffs between different techniques.