RUI/ROA: Support Tools for Memory-Based Filesystem

摘要：Conquest混合磁盘/内存文件系统采用了一种新的文件系统设计方法，将大部分信息存储在RAM中，将磁盘仅用于大文件。初步结果表明，尽管文件系统的磁盘部分尚未优化，但从Conquest方法中获得了巨大的好处。在这项研究中，我们将研究存储这些大容量磁盘文件的最佳方法。在回顾了前人对磁盘布局的研究之后，我们将设计并实现一个布局，该布局针对在没有元数据和小文件的环境中存储大文件进行了优化。我们还将开发一种“清洁器”，它将动态调整磁盘上数据的排列，以优化磁盘访问性能。最后，我们将采取措施量化新方法带来的改进。

Abstract:The Conquest hybrid disk/memory file system takes a new approach tofilesystem design by storing most information in RAM, devoting diskonly to large files. Preliminary results have shown great benefitsfrom the Conquest approach, despite the fact that the on-disk portionof the file system has yet not been optimized. In this research, wewill investigate the optimal method of storing those large disk-basedfiles. After reviewing prior research in disk layout, we will designand implement a layout that is optimized for storing large files in anenvironment that is free of metadata and small files. We will alsodevelop a "cleaner" that will dynamically adjust the arrangement ofon-disk data to optimize the performance of disk access. Finally, wewill take measurements to quantify the improvements brought by the newapproach.