一种基于FTAM的异步远程文件传送服务

本文建议了一种新的远程文件传送服务实现方式。通过引入ＦＴＡＭ路由器的概念，可利用ＯＳＩ／ＦＴＡＭ实现基于存储转发机制的异步远程文件传送服务，这种方法不仅有助于在异种机和异种网环境中提供远程文件传送服务，同时还将有利于平滑端系统及整个网络的负载。文章还讨论了数据加密机制在ＦＴＡＭ服务中的应用。     

异构环境下的文件传输服务系统（FTS）

本文介绍了一种异构环境下（异种网络协议、异种机）的多功能文件传输服务系统（ＦＴＳ）的设计和实现原理、系统提供的服务，以及系统的应用范围等。ＦＴＳ系统基于ＩＳＯ／ＯＳＩ的ＦＴＡＭ标准，采用了标准软件集成、队列管理技术和协议迁移技术，为用户提供了不同机型、不同操作系统、不同网络和协议（ＯＳＩ，ＳＮＡ，ＴＣＰ／ＩＰ等）之间的文件传输服务，并为用户进一步开发网络上的应用业务提供了良好的操作平台。     

File recovery by ISO FTAM

File recovery enhances the reliability and robustness of a network file management system. This capability of error detection and recovery is examined in an FTAM implementation. The issues of docket design, checkpoint insertion, recoverability, as well as interface transparency, are discussed in the paper. The impact of the recovery on the end-to-end performance and the effectiveness of the error recovery protocol in the light of failures are also examined by means of performance measurements. The result shows that the advantage gained by error recovery outweighs the protocol overheads incurred in the process.     

TOP／FTAM协议软件技术报告

本文描述了我们在ＵＮＩＸ／ＸＥＮＩＸ系统中开发的ＴＯＰ／ＦＴＡＭ软件，给出了系统结构设计考虑及主要实现技术，该软件可用于通过局域网或广域网互连的ＰＣ和ＳＵＮ工作站环境中。     

DotDFS: A Grid-based high-throughput file transfer system

DotGrid platform is a Grid infrastructure integrated with a set of open and standard protocols recently implemented on the top of Microsoft .NET in Windows and MONO .NET in UNIX/Linux. DotGrid infrastructure along with its proposed protocols provides a right and solid approach to targeting other platforms, e.g., the native C/C++ runtime. In this paper, we propose a new concurrent file transfer protocol called DotDFS as a high-throughput distributed file transfer component for DotGrid. DotDFS introduces some open binary protocols for efficient file transfers on current Grid infrastructures. DotDFS protocol also provides mechanisms for multiple file streams to gain high-throughput file transfer similar to GridFTP protocol, but by proposing and implementing a new parallel TCP connection-oriented paradigm. Almost no research work has been conducted to suggest a concurrent file transfer protocol that simultaneously employs threaded and event-driven models in the protocol level. Due to our knowledge, DotDFS is the first concurrent file transfer protocol that, from this viewpoint, presents a new computing paradigm in the field of data transmission protocols. In our LAN tests, we have achieved better results than Globus GridFTP implementation particularly in multiple TCP streams and directory tree transfers. Our LAN experiences in memory-to-memory tests show that DotDFS accesses to the 94% bottleneck bandwidth while GridFTP is accessing 91%. In LAN disk-to-disk tests, comparing DotDFS protocol with GridFTP protocol unveils a set of interesting and technical problems in GridFTP for both the nature of the protocol and its implementation by Globus. In the WAN experimental studies, we propose a new idea for analytical modeling of file transfer protocols like DotDFS inspired by sampling, experimentation and mathematical interpolation approaches. The cross-platform and open standard-based features of DotDFS provide a substantial framework for unifying data access and resource sharing in real heterogeneous Grid environments.     

可扩展网格文件访问接口的设计与实现

描述了网格文件访问接口(GFAI)的设计和实现。GFAI实现了一个与POSIX标准兼容的、可扩展的网格文件访问接口，屏蔽了不同存储系统访问协议的细节，解决了不同网格文件访问/传输协议的异构性问题，为用户提供了一个统一的、易于使用的网格I/O接口。     

GridFTP数据传输模型研究

通过分析传统C/S数据传输模型的不足,介绍了GridFTP第三方控制数据传输的概念、模型结构和工作流程.在此基础上,深入研究了GridFTP基于可靠文件传输RFT(Reliable File Transfer)服务的第三方控制数据传输的模型结构、RFT服务架构、实现细节以及扩展数据块工作模式,指出GridFTP协议能够满足网格平台数据传输的需要.     

The xDotGrid native,cross-platform,high-performance xDFS file transfer framework

In this paper we introduce and describe the highly concurrent xDFS file transfer protocol and examine its cross-platform and cross-language implementation in native code for both Linux and Windows in 32 or 64-bit multi-core processor architectures. The implemented xDFS protocol based on xDotGrid.NET framework is fully compared with the Globus GridFTP protocol. We finally propose the xDFS protocol as a new paradigm of distributed systems for Internet services, and data-intensive Grid and Cloud applications. Also, we incrementally consider different developmental methods of the optimum file transfer systems, and their advantages and disadvantages. The vision of this paper tries as possible to minimize the overhead concerned with the file transfer protocol itself and to examine optimal software design patterns of that protocol. In all disk-to-disk tests for transferring a 2 GB file with or without parallelism, the xDFS throughput at minimum 30% and at most 53% was superior to the GridFTP.     

EASE : A Software Environment for Automatic Implementation of Application Protocol

At present, ASN.1, and encoding and decoding rules, are not supported by Estelle. Estelle only specifies dynamic behaviours of protocols; and protocol data units of application layer protocol are specified in ASN.1. Hence, two standardized languages are required to specify an application protocol. In addition, Estelle and ASN.1 tools have been developed independently and do not support each other. As a result of these difficulties, the implementation of an application protocol is time consuming. To address this difficulty, we have proposed an approach which unified ASN.1 and Estelle specifications, and showed that the automatic implementation of an application protocol can be readily achieved by providing a software environment which supports this unified specification. This paper describes the detail of this software environment called EASE, and the results of using it to develop an implementation of the ISO FTAM protocol.