臺灣博碩士論文加值系統

分散式檔案系統(Distributed file system)能夠整合網路中的儲存裝置，並且將檔案儲存於遠端的檔案伺服器，客戶端可以透過網際網路隨時隨地存取位於伺服器中的檔案。目前已經有許多分散式檔案系統被廣泛使用，但是為了確保重要資料的可靠性與安全性，勢必要花費許多成本在伺服器端的維護上。因此，有研究提出使用網路空間來當作儲存媒體，這對於個人使用者或是小型企業來說是比較有效率的。不過目前這些使用網路空間的研究仍然有三個缺點：一、僅支援單一特定網路空間。二、無法確保敏感資料機密性。三、無法確保資料可靠性。
本篇論文提出一個使用網路空間做為儲存媒體的分散式檔案系統，稱為General File System (GFS)。透過結合分散式檔案系統之特性與網路空間的便利性，GFS能夠整合多個異質空間，使其成為一個大容量的儲存空間，並且保證系統的可靠性以及安全性。另外，GFS基於虛擬檔案系統設計來提供透通性，使用者透過虛擬檔案系統之介面即可完成檔案系統的操作，不需要知道實際檔案系統運作過程。最後，從我們的實驗證實GFS的存取效能要來的比目前使用網路空間的檔案系統來的優異。

A distributed file system integrates the storage devices on the network and stores files on remote file servers so that clients can access them through Internet anytime and anywhere. However, to ensure the reliability and security of critical data, the maintenance cost is usually high. Some researches propose solutions to use webspace as storage. These are efficient for individual users or small enterprises. However, these solutions have three drawbacks: 1) they support only single specific webspace, 2) they can not ensure data confidentiality, and 3) they can not ensure data reliability.
This thesis introduces a distributed file system, the General File System (GFS), which integrates the advantage of distributed file system and the convenience of webspace. GFS also integrates several heterogeneous spaces and promises the reliability and security. Besides, for users, it is easy to operate GFS through the interface provided by the virtual file system. At the end, the experiments result shows that GFS outperform than other solutions using webspace.

誌謝 i
中文摘要 ii
Abstract iii
Table of Contents iv
List of Figures v
List of Tables vi
Chapter 1 Introduction 1
1.1 Background 1
1.2 Motivation 1
1.3 Thesis Organization 2
Chapter 2 Related Works 3
2.1 Distributed File System 3
2.2 Utilitizing Webspace 5
Chapter 3 The Proposed System 6
3.1 Virtual File System 7
3.2 Implementation 7
3.3 Operations 12
3.4 Graphical User Interface 15
Chapter 4 Evaluation 17
Chapter 5 Conclusion and Future Work 21
5.1 Conclusion 21
5.2 Future Work 21
References 23

[1]B. Cai, C. Xie, and G. Zhu, “EDRFS: An Effective Distributed Replication File System for Small-File and Data-Intensive Application,” Proceedings of the 2nd International Conference on Communication Systems Software and Middleware (COMSWARE''07), pp. 1-7, Jan. 2007.
[2]P. M. Chen, E. K. Lee, G. A. Gibson, R. H. Katz, and D. A. Patterson, “RAID: High-performance, Reliable Secondary Storage,” ACM Computing Surveys, Vol. 26, No. 2, pp. 145-185, Jun. 1994.
[3]F. Garcia, A. Calderon, J. Carretero, J. M. Perez, and J. Fernandez, “A Parallel and Fault Tolerant File System Based on NFS Servers,” Proceedings of the 11th Euromicro Conference on Parallel, Distributed and Network-Based Processing (Euro-PDP’03), pp. 83-90, Feb. 2003.
[4]R. C. Jammalamadaka, R. Gamboni, S. Mehrotra, K. E. Seamons, and N. Venkatasubramanian, “gVault: A Gmail Based Cryptographic Network File System,” Proceedings of 21st Annual IFIP WG 11.3 Working Conference on Data and Applications Security, Vol. 4602, pp. 161-176, Jul. 2007.
[5]N. Joukov, A. Rai, and E. Zadok, “Increasing distributed storage survivability with a stackable RAID-like file system,” Proceedings of the 5th IEEE International Symposium on Cluster Computing and the Grid (CCGrid''05), pp. 82-89, May 2005.
[6]R. Sandberg, D. Goldberg, S. Kleiman, D. Walsh, and B. Lyon, “Design and Implementation of the Sun Network Filesystem,” Proceedings of the USENIX Summer Conference, pp. 119-130, Jun. 1985.
[7]A. Traeger, N. Joukov, J. Sipek, and E. Zadok, “Using Free Web Storage for Data Backup,” Proceedings of the 2nd ACM Workshop on Storage Security and Survivability (StorageSS ''06), pp. 73-78, Oct. 2006.
[8]F. Z. Wang, S. Wu, N. Helian, M. A. Parker, Y. Guo, Y. Deng, and V. R. Khare, “Grid-Oriented Storage: A Single-Image, Cross-Domain, High-Bandwidth Architecture,” IEEE Transactions on Computers, Vol. 56, No. 4, pp. 474-487, Apr. 2007.
[9]Y. Zhao, R. Tang, J. Xiong , and J. Ma, “IncFS: An Integrated High-Performance Distributed File System Based on NFS,” Proceedings of the 2006 International Workshop on Networking, Architecture and Storages (IWNAS''06), pp. 87-92, Aug. 2006.
[10]Commons VFS UI: A User Interface to Commons VFS, http://commons-vfs-ui.sourceforge.net/
[11]Commons Virtual File System – CommonsVFS, http://commons.apache.org/vfs/
[12]FUSE: Filesystem in Userspace, http://fuse.sourceforge.net/
[13]GMail API For Java (g4j), http://g4j.sourceforge.net/
[14]Gmail Filesystem - GmailFS, http://richard.jones.name/google-hacks/gmail-filesystem/gmail-filesystem.html
[15]Net - Apache Commons Net, http://commons.apache.org/net/
[16]OpenAFS, http://www.openafs.org/
[17]viksoe.dk - GMail Drive shell extension, http://www.viksoe.dk/code/gmail.htm