Experience with Connected and Disconnected Operation of Portable Notebook Computers in Distributed Systems

1994 First Workshop on Mobile Computing Systems and Applications Pub Date : 1994-12-08 DOI:10.1109/WMCSA.1994.23

D. Huizinga, K. A. Heflinger

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引用次数: 17

Abstract

DOC (Disconnected Operation Cache) is a two-level client caching system designed and implemented to support connected and disconnected operation of small form-factor, battery powered portable computers. This paper describes some design features of DOC, and our experiences with running it in the software engineering environment of AST Research. The uniqueness of the DOC project stems from the fact that it has been designed to completely support client caching and disconnected operation of currently existing portable notebook computers. The AST's local area network consisting of several Novell servers and top of the line notebooks running MS/DOS 6.2 as clients communicating via an Ethernet connection are used to support the system and perform experiments. DOC supports "connected", "partially disconnected", and "disconnected" modes of operation. The partially disconnected mode of operation has been designed to permit DOC to respond to requests on certain files that are not modified frequently, without server involvement. Results of our experiments indicate not only considerable performance gains for "connected" and "partially disconnected" system but also successful operation in the disconnected mode.

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便携式笔记本电脑在分布式系统中的连接和断开操作经验

DOC(断开操作缓存)是一个两级客户端缓存系统，旨在支持小型电池供电便携式计算机的连接和断开操作。本文介绍了DOC的一些设计特点，以及我们在AST Research的软件工程环境中运行DOC的经验。DOC项目的独特之处在于它被设计为完全支持客户机缓存和当前现有便携式笔记本电脑的断开连接操作。AST的局域网由几个Novell服务器和运行MS/DOS 6.2的顶级笔记本电脑组成，作为通过以太网连接进行通信的客户端，用于支持系统并进行实验。DOC支持“已连接”、“部分断开”和“断开”操作模式。部分断开连接的操作模式被设计为允许DOC响应对某些不经常修改的文件的请求，而不需要服务器参与。我们的实验结果表明，不仅“连接”和“部分断开”系统的性能显著提高，而且在断开模式下也能成功运行。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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1994 First Workshop on Mobile Computing Systems and Applications

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