Survey of the survivability of IT systems

Pentti Tarvainen

    Research output: Chapter in Book/Report/Conference proceedingConference article in proceedingsScientificpeer-review


    Failure of IT systems often causes a major loss of service. Thus their dependability has become an important issue. Recent facets of the dependability of IT systems, such as reliability, availability, safety, security, confidentiality, integrity, and maintainability do not address the needs of IT systems because they do not include the notion of a degraded service as an explicit requirement. The concept termed survivability is a precise notion of the forms of services that are acceptable in a system, the circumstances under which each form is most useful, and the fraction of time that is acceptable in degraded services. In this paper survivability is discussed as a necessary new facet of dependability. The contribution of this paper is to give system architects the latest knowledge on survivability in order to help them develop survivable IT systems. Definitions of dependability and survivability are presented and discussed. In addition, the key properties and survivability requirements, and the role of fault tolerance in survivable systems are discussed. Furthermore, survivability implementation techniques and examples of survivability architectures are introduced and discussed. Finally, software architecture design and analyzing methods and frameworks relevant to survivability are discussed.
    Original languageEnglish
    Title of host publicationNordSec 2004, Proceedings of the Ninth Nordic Workshop on Secure IT Systems
    Subtitle of host publicationEncouraging co-operation
    EditorsSanna Liimatainen, Teemupekka Virtanen
    PublisherHelsinki University of Technology
    ISBN (Print)951-22-7348-9
    Publication statusPublished - 2004
    MoE publication typeA4 Article in a conference publication
    Event9th Nordic Workshop on Secure IT Systems, NORDSEC 2004 - Helsinki University of Technology, Espoo, Finland
    Duration: 4 Nov 20045 Nov 2004

    Publication series

    SeriesPublications in telecommunications software and multimedia A


    Conference9th Nordic Workshop on Secure IT Systems, NORDSEC 2004


    • Dependability
    • reliability
    • security
    • survivability


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