We propose a manager architecture for hierarchical management based on a DBMS core module, aiming to minimize the management traffic overhead and the system response time. All management information and services, including manager-to-manager communication and inter-operation, are mapped on objects stored in the DBMS. We define key management services covering manager-tomanager communication and most of the OSI System Management Functions (SMFs), and present their mapping on database objects. Depending on access patterns, three update methods for the database objects are supported: periodical (polling), on demand (lazy) and on demand with a temporal tolerance. In our research we consider two data models (relational, object-oriented) and standard protocols (SNMP, SNMPv2, CMIP). I. INTRODUCTION Network management is data-based[26]. Vast amounts of information (especially in large, complex networks) are collected by the network agents and sent to the manager sites. The manager collects ne...

Because it affects such things as the degree to which logical concurrency can be realized by physically concurrent devices, the concurrency architecture of software can have a large impact on performance. Architectural decisions such as concurrency are typically made early in the development of software, and are di#cult to change once the software has begun to be fleshed out. It is therefore useful to be able to evaluate the feasibility of software concurrency architectures proposed for a set of scenarios and a set of responsetime requirements which, in part, define a particular software project. Such evaluation, however, is difficult because it is hard to predict the effects of pre-emption, the amount of concurrency-related overhead generated, and which portions of scenarios will actually be performed in parallel and which will for some reason end up serialized. So that one can discover possible ways to improve a concurrency architecture, it is also useful to diagnose an architecture for ...

The Management of Distributed Applications and Systems (MANDAS) project addresses problems arising in the management of distributed applications. Specifically, we are studying the areas of configuration management, fault management, performance management, and application metrics and modeling. We are also investigating the tools, techniques and services needed to support the above management applications. The MANDAS Management Information Repository (MIR) provides database support for the management applications and supports their integration into a single management environment. In this paper we examine the problem of distributed applications management to extract the requirements for a MIR. Based on the requirements, we present an information model for distributed applications management and outline a prototype MIR developed for the MANDAS project.

Databases have been proposed as the chosen platform to develop automated control systems for environments where the state of the system changes rapidly, and actions need to be taken with timing constraints, such as stock trading, air traffic control, network management and process control to name a few. The workload in such systems consist primarily of two types: (a) updates, which report the state of the environment to the database and arrive very frequently, and (b) transactions which arrive with deadlines. In this paper we develop algorithms to install these updates rapidly enough to ensure "state recency" while allocating sufficient resources to transactions to minimize tardiness. We also require that these transactions read temporally consistent data. In summary, this paper contributes in the following three interrelated issues: 1. First and foremost, we look at some interesting problems regarding amalgamating temporal and real-time databases 2. We look at simultaneous satisfacti...

A hybrid network consisting of a satellite network and a terrestrial network will increase the overall network efficiency considerably by using all available resources and media. This dissertation considers dynamic routing in both voice/data-integrated and ATM-based hybrid networks. Optimal dynamic routing in such mixed-media (voice/data-integrated) networks under Markov Queueing Modeling has been developed and solved. Routing problems in such a domain usually lead to a weighted-sum minimization or a minimax problem. A new approach to obtain the trade-off curve of multiple-objective optimization is outlined. With a numerical optimization package, we can plot the trade-off curve exactly. Both a centralized and a distributed implementation of this problem with Kalman filter techniques and Equilibrium Programming are presented. These techniques allow the control of a large and stochastic network by communicating with a group of communication managers in a parallel manner. For ATM-based hybrid networks, an economic model with the objective of maximizing the "social welfare" has been adapted. This model can be developed into a form of a two-player game. With a little modification and adaptation, we will be able to solve the joint problem of access control and routing in both the weighted-sum formulation and the economic formulation.