B. S. White, A. S. Grimshaw, and A. Nguyen-Tuong, "Grid-Based File Access: The Legion I/O Model," in Proceedings of the Ninth IEEE International Symposium on High Performance Distributed Computing (HPDC'00). Pittsburgh, USA: IEEE Computer Society, august 2000.  Home/Search   Document Details and Download   Summary   Related Articles   Check

....transfers and copies the entire file, causing unnecessary I O traffic. 5 Globus, serving as an infrastructure for grid computing, provides access to remote files through x gass, ftp or HTTP protocols [17] White et al. have proposed the Legion I O model that provides a remote access capability [41]. Legion achieves 55 65 of ftp s write bandwidth and 70 85 of ftp s read bandwidth for mass transfers. The performance of Legion suffers due to the protocol overhead if the transfer sizes are less than 1Mbyte. To allow end users to exploit context space and manipulate context structure, Legion ....

....the approach relies on Kangaroo s ability to overlap CPU and I O processing intervals by using background processes to move data and handle errors. 4. Security Issue With the usage of different machines in a Grid, the issue of security, which has been provided by most existing data grids [12] 26][41], becomes one of the prime concerns. In principle, traditional security techniques, such as encryption and access control, can be conservatively applied to a grid. For example, a user has to be authenticated and authorized before contacting any remote site. Due to the space limitation, in what ....

B. White, A.S.Grimshaw, and A. Nguyen-Tuong, "Grid-Based File Access: The Legion I/O Model," Proc. of High Performance Distributed Computing, 2000.

....transfer of file system data file contents, directories, and attributes. Unlike related ondemand grid data access solutions, the proposed approach does not require modifications to applications or special libraries (e.g. as in Condor [8] 10] or non native NFS servers (e.g. as in Legion [9]) The contributions of this paper with respect to previous work in grid virtual file systems [2] are novel application transparent techniques that implement 1) inter proxy encryption and authentication, and 2) disk caching via the addition of client side proxies. The paper also reports on the ....

....to access data on the grid. Some systems (e.g. Condor [8] 10] utilize remote I O mechanisms implemented in special libraries to allow applications to access files. In contrast, VP GFS allows unmodified applications to access grid data using conventional operating system clients servers. Legion [9] employs a modified daemon to provide access to a remote file system. In contrast, the approach of this paper leverages performance and reliability characteristics of native O S clients servers. NeST [25] is a software grid storage appliance that supports the NFS protocol, among others. However, ....

B. White, A. Grimshaw, and A. Nguyen-Tuong, "Grid-based File Access: the Legion I/O Model", in Proc. 9th IEEE Int. Symp. on High Performance Distributed Computing (HPDC), pp165-173, Aug 2000.

....file system. File staging approaches require the user to specify the files to be transferred, transfer whole files when they are opened, and pose application programming challenges. Data management solutions that support on demand transfer have also been deployed within Condor [32] and Legion [37]. Within the context of the PUNCH virtual file system (PVFS) previous work has shown that a data management model supporting simple on demand data transfers without requiring dynamically linked libraries or changes to native OS file system clients and servers can be achieved by way of two ....

B. S. White, A. S. Grimshaw, and A. Nguyen-Tuong. Gridbased file access: The Legion I/O model. In Proceedings of the 9th IEEE International Symposium on High Performance Distributed Computing (HPDC'00), pages 165--173, Pittsburgh, Pennsylvania, August 2000.

....Client side VFS proxies at the host V cache VM state from image servers (e.g. server I) while proxies within virtual machines cache user blocks from a data server D. challenges. Data management solutions that support on demand transfer have also been deployed within Condor [31] and Legion [34]. Within the context of the PUNCH virtual file system (PVFS) previous work has shown that a data management model supporting simple on demand data transfers without requiring dynamically linked libraries or changes to native OS file system clients and servers can be achieved by way of two ....

Brian S. White, Andrew S. Grimshaw, and Anh Nguyen-Tuong. Grid-based file access: The Legion I/O model. In Proceedings of the 9th IEEE International Symposium on High Performance Distributed Computing (HPDC'00), pages 165--173, Pittsburgh, Pennsylvania, August 2000.

....protocols suitable for grid computing and can run without special privilege. A wide variety of mechanisms for building interposition agents have been proposed, including system call interception [1, 18] static relinking [19] binary rewriting [40, 16] and emulation through an existing interface [38]. We are making use of Bypass [32, 33] due to its low overhead and ability to be used without special privileges. 7. CONCLUSION Communities are natural structures for localizing application I O on the grid. By binding CPUs and storage together into organizations that reflect the physical ....

B. White, A. Grimshaw, and A Nguyen-Tuong. Grid-Based File Access: The Legion I/O Model. In Proceedings of the 9th IEEE Symposium on High Performance Distributed Systems, August 2000.

....for attaching to it. Several mechanisms have been proposed. Kangaroo uses library preloading, facilitated by Bypass [24] Many other mechanisms are possible, including system call interception [2, 18] static relinking [22] binary rewriting [27, 17] and emulation through an existing interface [26]. Using these mechanisms, a variety of data movement systems may be attached. Representative examples include Condor [22] GASS [7] and Legion [26] The Condor remote system call facility performs all application I O as fine grained read and write operations over a TCP connection to the ....

....possible, including system call interception [2, 18] static relinking [22] binary rewriting [27, 17] and emulation through an existing interface [26] Using these mechanisms, a variety of data movement systems may be attached. Representative examples include Condor [22] GASS [7] and Legion [26]. The Condor remote system call facility performs all application I O as fine grained read and write operations over a TCP connection to the submission site. GASS allows an application to pull and push whole files synchronously when they are opened and closed, respectively. GASS also allows files ....

B. White, A. Grimshaw, and A. Nguyen-Tuong. Grid-Based File Access: The Legion I/O Model. In Proceedings of the 9th IEEE Symposium on High Performance Distributed Systems, August 2000.

....grid middleware. This mechanism differs from related work in filestaging techniques (e.g. Globus [4] and PBS [6, 3] in that it supports user transparent, on demand transfer of data. It differs from related on demand data access solutions for grid computing (e.g. Condor [11] and Legion [5, 19]) in that it does not require modifications to applications and it does not rely on non native file system servers. Thus, the described virtual file system is unique in its ability to provide on demand access to data for unmodified applications through native NFS clients and servers of standard ....

....Condor [11] utilize remote I O mechanisms to allow applications to access remote files. This approach requires applications to be re linked with special libraries, making it unsuitable for situations where object or source code is not available (e.g. as with commercial applications) Legion [5, 19] employs a modified NFS daemon to provide a virtual file system. 7 From an implementa 7 This approach has also been investigated in the context of tion standpoint, this approach is less appealing than call forwarding: the NFS server must be modified and extensively tested for compliance and ....

B. S. White, A. S. Grimshaw, and A. Nguyen-Tuong. Grid-based file access: The Legion I/O model. In Proceedings of the 9th IEEE International Symposium on High Performance Distributed Computing (HPDC'00), pages 165--173, Pittsburgh, Pennsylvania, August 2000.

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B. White, A. Grimshaw, and A. Nguyen-Tuong, "Grid Based File Access: The Legion I/ O Model," to Proceedings of the Symposium on High Performance Distributed Computing (HPDC-9), Aug 2000, Pittsburgh, PA.

....traditional volume oriented approach. The gross disparity in potential parallelism between the two experimental setups is intentional, and serves to validate the move from monolithic servers as employed by NFS to the peer to peer architecture advocated by Legion, xFS [4] and others. Previous work [42] examined Legion wide area I O performance alongside the Globus [14] I O facility and FTP, the de facto means of transferring files in a wide area environment. Each benchmark utilizes the Centurion cluster [28] at the University of Virginia. These experiments employ 400 Mhz dualprocessor Pentium ....

B. S. White, A. S. Grimshaw, and A. Nguyen-Tuong. Grid-based file access: The legion i/o model. In Proceedings of the Ninth IEEE International Symposium on High Performance Distributed Computing, Pittsburgh, PA, August 2000. IEEE Computer Society Press.

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WHITE00 White, B. S., Grimshaw, A. S., Nguyen-Tuong, A., Grid-Based File Access: The Legion I/O Model, Proc. of the 9 th Intl. Symp. on High Performance Distributed Computing, August 2000.

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B. S. White, A. S. Grimshaw, and A. Nguyen-Tuong, "Grid-Based File Access: The Legion I/O Model," in Proceedings of the Ninth IEEE International Symposium on High Performance Distributed Computing (HPDC'00). Pittsburgh, USA: IEEE Computer Society, august 2000.

No context found.

B. White, A. Grimshaw, and A Nguyen-Tuong. Grid-Based File Access: The Legion I/O Model. In Proceedings of the Ninth IEEE Symposium on High Performance Distributed Computing, August 2000.

No context found.

B. White, A. Grimshaw, and A Nguyen-Tuong. Grid-Based File Access: The Legion I/O Model. In Proceedings of the Ninth IEEE Symposium on High Performance Distributed Computing, August 2000.

No context found.

B. White, A. Grimshaw, and A. Nguyen-Tuong, Grid-Based File Access: The Legion I/O Model, in Proceedings of the Ninth IEEE Symposium on High Performance Distributed Computing, August 2000.

No context found.

B. White, A. Grimshaw, and A. Nguyen-Tuong. Grid-Based File Access: The Legion I/O Model. In Proceedings of the Ninth IEEE Symposium on High Performance Distributed Computing, August 2000.

No context found.

B. White, A. Grimshaw, and A. Nguyen-Tuong, Grid-Based File Access: The Legion I/O Model, in Proceedings of the Ninth IEEE Symposium on High Performance Distributed Computing, August 2000.

No context found.

B. White, A. Grimshaw, and A. Nguyen-Tuong. Grid-Based File Access: The Legion I/O Model. In Proceedings of the Ninth IEEE Symposium on High Performance Distributed Computing, August 2000.

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