外文翻譯----文件系統(tǒng)虛擬化和服務(wù)網(wǎng)格數(shù)據(jù)管理(存儲(chǔ)版)
【正文】 behaviors and the surrounding environments. Dynamically changing application workload and resource availability further require continuous monitoring of data sessions and timely adaptation of their configurations. These requirements are often beyond the capability of endusers and even system administrators. Yet the goals of users or administrators are rather simple and explicit. For example, from an application user39。 it has also been successfully deployed in a production grid system [2][3] for several years, supporting scientific tools and users from many disciplines. The data management system proposed in this dissertation is architected to address three important questions, which are discussed in the following subsections respectively. ApplicationTransparent GridWide Data Access The first question is, how to provide applicationtransparent gridwide data access? Grids difer from traditional distributed puting environments because of their distinct characteristics, ., widearea working, heterogeneous end systems, and disjoint administrative domains. These diferences bring new challenges to data management systems, and the technologies that are successful in localarea works (LAN), ., LAN file systems, cannot be directly applied in a grid environment. Instead, grid data management needs to specifically address these unique issues. Existing solutions allow applications to access grid data through the use of specialized APIs or libraries. However, the required modifications on application sources or binaries often place a burden upon the shoulders of end users and developers, and present a hurdle to applications that cannot be easily modified. Therefore, applicationtransparency is desirable to facilitate the deployment of a wide range of applications on grids, where gridenabling should be the responsibility of the grid middleware but not the application users or developers. This dissertation presents a userlevel DFS virtualization, namely Grid Virtual File System (GVFS), for applicationtransparent grid data access. Because the wellknown DFS interface is preserved by GVFS and presented to applications, no modifications are required to their source code, libraries, or binaries. In addition, the proposed approach is based on userlevel virtualization techniques, which requires no changes to existing O/Ss and can be conveniently deployed on grid resources. Furthermore, userlevel enhancements designed for gridstyle environments are built upon the virtualization layer to enable data provisioning with applicationdesired characteristics. In short, the proposed GVFS approach answers the first question by providing transparent gridwide data access for unmodified applications and O/Ss through the userlevel DFS virtualization. ApplicationTailored Grid Data Provisioning The second question is, how to provide data with applicationtailored optimizations? Typical O/Ss are designed to support generalpurpose applications, but it is often the case that one size does not fit all. Applications have diverse characteristics and requirements, in terms of, for example, data acces
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