3. Overview of the Service Availability Architecture

  1. Maria Toeroe2 and
  2. Francis Tam3
  1. Dave Penkler

Published Online: 18 MAR 2012

DOI: 10.1002/9781119941378.ch3

Service Availability: Principles and Practice

Service Availability: Principles and Practice

How to Cite

Penkler, D. (2012) Overview of the Service Availability Architecture, in Service Availability: Principles and Practice (eds M. Toeroe and F. Tam), John Wiley & Sons, Ltd, Chichester, UK. doi: 10.1002/9781119941378.ch3

Editor Information

  1. 2

    Ericsson, Town of Mount Royal, Quebec, Canada

  2. 3

    Nokia Research Center, Helsinki, Finland

Author Information

  1. Hewlett-Packard, Grenoble, France

Publication History

  1. Published Online: 18 MAR 2012
  2. Published Print: 20 APR 2012

ISBN Information

Print ISBN: 9781119954088

Online ISBN: 9781119941378



  • SA Forum architecture, logical software;
  • architecture behind SA, specifications;
  • architecture problems, interface standards;
  • open HA, architecture;
  • HA standard interfaces, reuse, portability;
  • SAI specifications, performance trade-offs;
  • SA Forum, levels of SA and continuity;
  • concrete API, in ANSI ‘C’ syntax;
  • HA middleware, as AMM;
  • AIS service, matched to configured resources


The purpose of this chapter is to provide readers with some background and an overview of the architecture and the service availability interface specifications published by the SA Forum. We present the software architecture of the SA Forum system by examining how the functional, dynamic and static views are reflected in the specifications. An overview of the hardware and application interface specifications is given illustrated by the functions, interactions and groupings of the different services according to their role in the system architecture. The essential and optional dependencies and interrelations between the services are discussed. We conclude with some reflections on open issues and future directions.