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Author | : James J. Kistler |
Publisher | : Springer Science & Business Media |
Total Pages | : 284 |
Release | : 1995-12-13 |
Genre | : Computers |
ISBN | : 9783540606277 |
Download Disconnected Operation in a Distributed File System Book in PDF, ePub and Kindle
This book is based on the author's PhD thesis which was selected during the 1993 ACM Doctoral Dissertation Competition as one of the three best submissions. The focus of this work is on the issue of availability in distributed file systems. It presents the important new technique called disconnected operation, in which clients mask failures and voluntary network detachments by emulating the functionality of servers where actual server-oriented solutions are inadequate. This permits client operation even under complete isolation from the server; the clean integration of mobile computers into the system is an important side-effect of the new technique. The design and implementation of disconnected file service in a working system, the Coda file system, is described in detail.
Author | : James Jay Kistler |
Publisher | : |
Total Pages | : 249 |
Release | : 1995 |
Genre | : Electronic data processing |
ISBN | : 9780387606279 |
Download Disconnected Operation in a Distributed File System Book in PDF, ePub and Kindle
Author | : Chetan Ahuja |
Publisher | : |
Total Pages | : 128 |
Release | : 2001 |
Genre | : Distributed databases |
ISBN | : |
Download Design of a High Performance, High Availability, Distributed File System Book in PDF, ePub and Kindle
Author | : Carnegie Mellon University. Computer Science Department |
Publisher | : |
Total Pages | : 0 |
Release | : 1996 |
Genre | : Client/server computing |
ISBN | : |
Download Exploiting Weak Connectivity in a Distributed File System Book in PDF, ePub and Kindle
Abstract: "Weak connectivity, in the form of intermittent, low- bandwidth, or expensive networks is a fact of life in mobile computing. For the foreseeable future, access to cheap, high-performance, reliable networks, or strong connectivity will be limited to a few oases, such as work or home, in a vast desert of weak connectivity. The design of distributed file systems has traditionally been based on an assumption of strong connectivity. Yet, to provide ubiquitous data access, it is vital that distributed file systems make effective use of weak connectivity. This dissertation describes the design, implementation, and evaluation of weakly connected operation in the Coda File System. The starting point of this work is disconnected operation, in which a file system client operates using data in its cache during server or network failures. Disconnected clients suffer from many limitations: updates are not visible to other clients, cache misses may impede progress, updates are at risk from client loss or damage, and the danger of update conflicts increases as disconnections are prolonged. Weak connectivity provides an opportunity to alleviate these limitations. Coda's strategy for weakly connected operation is best characterized as application-transparent adaptation. The system bears full responsibility for coping with the demands of weak connectivity. This approach preserves upward compatibility by allowing applications to run unchanged. Coda provides several mechanisms for weakly connected operation motivated by actual experience. The foundation of adaptivity in this system is the communications layer, which derives and supplies information on network conditions to higher system layers. The rapid cache validation mechanism enables the system to recover quickly in intermittent environments. The trickle reintegration mechanism insulates the user from poor network performance by propagating updates to servers asynchronously. The cache miss handling mechanism alerts the user to potentially lengthy service times and provides opportunities for intervention. A quantitative evaluation of these mechanisms, based on controlled experimentation and empirical data gathered from the deployed system in everyday use, shows that Coda is able to provide good performance even when network bandwidth varies over four orders of magnitude -- from modem speeds to Lan speeds."
Author | : Tomasz Imielinski |
Publisher | : Springer |
Total Pages | : 736 |
Release | : 2007-08-26 |
Genre | : Computers |
ISBN | : 0585296030 |
Download Mobile Computing Book in PDF, ePub and Kindle
The rapid development of wireless digital communication technology has cre ated capabilities that software systems are only beginning to exploit. The falling cost of both communication and of mobile computing devices (laptop computers, hand-held computers, etc. ) is making wireless computing affordable not only to business users but also to consumers. Mobile computing is not a "scaled-down" version of the established and we- studied field of distributed computing. The nature of wireless communication media and the mobility of computers combine to create fundamentally new problems in networking, operating systems, and information systems. Further more, many of the applications envisioned for mobile computing place novel demands on software systems. Although mobile computing is still in its infancy, some basic concepts have been identified and several seminal experimental systems developed. This book includes a set of contributed papers that describe these concepts and sys tems. Other papers describe applications that are currently being deployed and tested. The first chapter offers an introduction to the field of mobile computing, a survey of technical issues, and a summary of the papers that comprise sub sequent chapters. We have chosen to reprint several key papers that appeared previously in conference proceedings. Many of the papers in this book are be ing published here for the first time. Of these new papers, some are expanded versions of papers first presented at the NSF-sponsored Mobidata Workshop on Mobile and Wireless Information Systems, held at Rutgers University on Oct 31 and Nov 1, 1994.
Author | : |
Publisher | : |
Total Pages | : 818 |
Release | : 1994 |
Genre | : Aeronautics |
ISBN | : |
Download Scientific and Technical Aerospace Reports Book in PDF, ePub and Kindle
Author | : Temidayo Oluwafunke Ogunniyi |
Publisher | : |
Total Pages | : 212 |
Release | : 2009 |
Genre | : Distributed operating systems (Computers) |
ISBN | : |
Download Resolving Network Congestion in Mobile Computing Using Coda File System Book in PDF, ePub and Kindle
With this research, we focus on utilizing a distributed file system to combat congestion problems in wireless networks. The Coda file system is our choice of a distributed file system, as it offers several services, such as data pre-fetching, hoarding of files, disconnected operation and data consistency.
Author | : Kian-Lee Tan |
Publisher | : Springer |
Total Pages | : 283 |
Release | : 2003-06-29 |
Genre | : Computers |
ISBN | : 354044498X |
Download Mobile Data Management Book in PDF, ePub and Kindle
Welcome to the Second International Conference on Mobile Data Management (MDM2001). The conference serves as a forum for the exchange of technical ideas and research results in the areas of mobility and database management. This year, we have a very exciting program for MDM2001. Many quality papers were submitted to the conference. All of the submitted papers were - viewed by at least three PC members. Due to the limitations of the program schedule as well as the desire to organize the conference using a single track format, we selected only 18 papers for full presentation at the conference. As a result many excellent papers could not be accepted. The papers chosen for presentation span a large range of topics, from n- work protocol issues up to the semantics of mobile applications. The common theme of all these papers is their recognition of the central role played by data managementtechniques in the developmentof the emerging worldof mobile and wireless applications. We have loosely organized these papers into six areas: 1. DATA MANAGEMENT ARCHITECTURES, 2. CONTENT DELIVERY, 3. DATA BROADCASTING, 4. CACHING AND HOARDING, 5. COPING WITH MOVEMENT, 6. NETWORKS AND SYSTEMS ISSUES In addition to the researchtrack, we havesought to broaden the scope of the conference with an industrial session as well as poster presentations. Overall, the program strikes a comfortable balance between applied and theoretically oriented papers.
Author | : Thomas D.C. Little |
Publisher | : Springer Science & Business Media |
Total Pages | : 376 |
Release | : 1995-11-30 |
Genre | : Computers |
ISBN | : 9783540606475 |
Download Network and Operating Systems Support for Digital Audio and Video Book in PDF, ePub and Kindle
The prevailing orthodoxy according to which all macroeconomic theory should be reducible to microeconomics is criticized. Such a dogma excludes from economics the creation of new knowledge, which - as distinguished from the mere transmission of knowledge in education and training - is a social process not reducible to microeconomics. A mathematical extension of the Lucas theory to allow for the effects of creation of knowledge upon economic development is shown to improve essentially the prediction of business cycle data, when compared with the conventional real business cycle models of Kydland and Prescott, Hansen and Rogerson, and Danthine and Donaldson.
Author | : PRADEEP K. SINHA |
Publisher | : PHI Learning Pvt. Ltd. |
Total Pages | : 761 |
Release | : 1998-01-01 |
Genre | : Computers |
ISBN | : 8120313801 |
Download DISTRIBUTED OPERATING SYSTEMS Book in PDF, ePub and Kindle
The highly praised book in communications networking from IEEE Press, now available in the Eastern Economy Edition.This is a non-mathematical introduction to Distributed Operating Systems explaining the fundamental concepts and design principles of this emerging technology. As a textbook for students and as a self-study text for systems managers and software engineers, this book provides a concise and an informal introduction to the subject.