Login | Register

The HAS architecture : a highly available and scalable cluster architecture for Web servers


The HAS architecture : a highly available and scalable cluster architecture for Web servers

Haddad, Ibrahim (2006) The HAS architecture : a highly available and scalable cluster architecture for Web servers. PhD thesis, Concordia University.

Text (application/pdf)
NR16284.pdf - Accepted Version


This dissertation proposes a novel architecture, called the HAS architecture, for highly available and scalable web server clusters. The proof-of-concept of the HAS architecture was validated for performance and scalability, tested for its failover mechanisms, and externally modeled and simulated to study the failure and repair behavior and to calculate the availability of the cluster. The HAS architecture is able to maintain the base line performance per cluster processor, for up to 16 traffic processors in the cluster, achieving close to linear scalability. The architecture supports dynamic traffic distribution, supports heterogeneous cluster nodes, provides a mechanism to keep track of available cluster nodes, and offers connection synchronization to ensure that web connections survive software or hardware failures. Furthermore, the architecture supports different redundancy models and high availability capabilities such as Ethernet and NFS redundancy, and node level redundancy that contribute in increasing the availability of the service, and in eliminating single points of failure. This dissertation presents current methods for scaling web servers, discusses their limitations, and investigates how clustering technologies can help overcome some of these challenges and enable the design of scalable web servers based on a cluster of workstations. It examines various ongoing research projects in the academia and the industry that are investigating scalable and highly available architectures for web servers. It discusses their scope, architecture, provides a critical analysis of their work, and presents their contributions to this dissertation. This dissertation contributes the HAS architecture, a highly available and scalable architecture for web servers, and offers contributions in areas of scalability, maintaining baseline performance, and availability

Divisions:Concordia University > Gina Cody School of Engineering and Computer Science > Computer Science and Software Engineering
Item Type:Thesis (PhD)
Authors:Haddad, Ibrahim
Pagination:xi, 181 leaves : ill. ; 29 cm.
Institution:Concordia University
Degree Name:Ph. D.
Program:Computer Science and Software Engineering
Thesis Supervisor(s):Butler, Gregory
ID Code:8890
Deposited By: Concordia University Library
Deposited On:18 Aug 2011 18:38
Last Modified:18 Jan 2018 17:34
Related URLs:
All items in Spectrum are protected by copyright, with all rights reserved. The use of items is governed by Spectrum's terms of access.

Repository Staff Only: item control page

Downloads per month over past year

Back to top Back to top