We present a distributed agent based system used to monitor, configure and control complex, large scale data transfers in the Wide Area Network. The Localhost Information Service Agent (LISA) is a lightweight dynamic service that provides complete system and applications monitoring, is capable to dynamically configure system parameters and can help in optimizing distributed applications. As par...

In this paper, we argue for the power of providing a common set of OS services to wide area applications, including mechanisms for resource discovery, persistent storage, remote process execution, resource management, authentication, and security. On a single machine, application developers can rely on the local operating system to provide these abstractions. In the wide area, however, applicat...

The Wide-Area Augmentation System (WAAS) is being rapidly developed by the Federal Aviation Administration for supplemental operational use in 1997. In time, it will be a primary navigation aid for all phases of flight down to Category I precision approach. The WAAS will include a network of approximately 20 to 30 Wide-area Reference Stations (WRSs) distributed around the National Airspace Syst...

Current wide area distributed systems fail to hide implementation aspects related to the distribution of information. Unfortunately, the solutions developed for local systems do not scale, so a different approach is needed. In this paper we present an architecture for distributed systems that scales to support a large number of users and objects. The architecture is based on the concept of dist...

Since the early 1980s, the Tracker Project at the University of North Carolina at Chapel Hill has been working on wide-area head tracking for virtual and augmented environments. Our long-term goal has been to achieve the high performance required for accurate visual simulation throughout our entire laboratory, beyond into the hallways, and eventually even outdoors. In this article, we present r...

The current generation of le systems are inadequate in facing the new technological challenges of wide area networks and massive storage. xFS is a prototype le system we are developing to explore the issues brought about by these technological advances. xFS adapts many of the techniques used in the eld of high performance multiprocessor design. It organizes hosts into a hierarchical structure s...

This paper describes the design, implementation, and performance of Neo, a wide-area file system whose security architecture is based on the chit. Chits are instantiations of capabilities that capitalize on the strengths of traditional capabilities (flexible granularity, rights tied to naming, non-traditional identities) while mitigating the drawbacks (revocation, accountability, lack of confin...

Wide-area protection system (WAPS) is widely studied for the purpose of improving the performance of conventional backup protection. In this paper, the system architecture of WAPS is proposed and its key technologies are discussed in view of engineering projects. So a mixed structurecentralized-distributed structure which is more suitable for WAPS in limited power grid region, is obtained based...