Design and implementation of XML-based Linux file system runner

This thesis presents the design and implementation of XML_based Linux File System Runner (XML_LFS), a file system simulator that integrates the representation ability of Extensible Markup Language (XML) with the beauty of Linux file system architecture. XML_LFS uses a layered approach to design a generic file system runner from scratch utilizing Java programming language and JDOM. The hierarchical directory structure of the file system is kept in an XML file for easy manipulation as well as on disk for crash recovery. UNIX-like file systems such as the Second Extended File System (Ext2), a native mini file system (mini3fs) and Linux kernel codes for file system operations are explored for the real implementation work.;Traditional file system consists of a hierarchical tree, composed of directories and files. Each directory can contain both files and subdirectories. This is an equivalent concept to semi-structured elements in XML. Embedding an XML log file layer into the Linux file system architecture can speed up the directory look up by combining the power of XML and XQuery as well as eliminating the limitations of the existing fixed-attribute file system model by treating files as elements to a customizable XML document. Thus, the whole development environment is more useful for future file system research. The future of XML file system is discussed in detail. Complete system architecture and functionalities are built and the process is described in the thesis. Initial Bonnie-like and Andrew-like benchmarks of the prototype implementation show that XML_LFS achieves the expected performance results

Elevating commodity storage with the SALSA host translation layer

To satisfy increasing storage demands in both capacity and performance, industry has turned to multiple storage technologies, including Flash SSDs and SMR disks. These devices employ a translation layer that conceals the idiosyncrasies of their mediums and enables random access. Device translation layers are, however, inherently constrained: resources on the drive are scarce, they cannot be adapted to application requirements, and lack visibility across multiple devices. As a result, performance and durability of many storage devices is severely degraded. In this paper, we present SALSA: a translation layer that executes on the host and allows unmodified applications to better utilize commodity storage. SALSA supports a wide range of single- and multi-device optimizations and, because is implemented in software, can adapt to specific workloads. We describe SALSA's design, and demonstrate its significant benefits using microbenchmarks and case studies based on three applications: MySQL, the Swift object store, and a video server.Comment: Presented at 2018 IEEE 26th International Symposium on Modeling, Analysis, and Simulation of Computer and Telecommunication Systems (MASCOTS

Organizing information on the next generation web - Design and implementation of a new bookmark structure

The next-generation Web will increase the need for a highly organized and ever evolving method to store references to Web objects. These requirements could be realized by the development of a new bookmark structure. This paper endeavors to identify the key requirements of such a bookmark, specifically in relation to Web documents, and sets out a suggested design through which these needs may be accomplished. A prototype developed offers such features as the sharing of bookmarks between users and groups of users. Bookmarks for Web documents in this prototype allow more specific information to be stored such as: URL, the document type, the document title, keywords, a summary, user annotations, date added, date last visited and date last modified. Individuals may access the service from anywhere on the Internet, as long as they have a Java-enabled Web browser