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Probability of SLA Violation for Semi-Markov Availability

Gupta, Vivek
http://rave.ohiolink.edu/etdc/view?acc_num=ohiou1235610777

Abstract Details

2009, Master of Communication Technology and Policy (MCTP), Ohio University, Information and Telecommunication Systems (Communication).
The purpose of this thesis is to investigate availability distributions and the probability of Service Level Agreement (SLA) violation for telecommunication services requiring high availability, such as 0.99999. This research deals with availability SLAs between information technology service providers, such as carriers, and user corporations. A combination of five different reliability/maintainability scenarios and three different time intervals have been used to generate availability distributions in order to assess the efficacy of availability guarantees. Moreover, Markov and semi-Markov models are used to provide a comparative analysis of the availability distributions and probability of service level violation. In the semi-Markov model, long tail and short tail lognormal distributions are used for the repair time. A Monte Carlo simulation program is developed in JAVA to achieve the research goal. From the generated distributions it is found that there are significant chances of SLA violation, given a wide range of different reliability/maintainability levels used to achieve 0.99999 availability, and the SLA time interval. Importantly, the results are fairly sensitive to the tail of the repair distribution, meaning it is essential to understand repair distribution in order to assess chances of SLA violation. Moreover, results suggest that the way to dramatically decrease the probability of SLA violation is through availability engineering margin. Delivering availability beyond 0.99999 through redundancy and responding more rapidly to failures greatly diminishes the chances of violating a 0.99999 SLA.
Andrew P. Snow, PhD (Advisor)
Gary Weckman, PhD (Committee Member)
Lawrence Wood, PhD (Committee Member)
178 p.
Information Systems
SLA Violation; Availability; Semi-Markov Model

Recommended Citations

Citations

  • Gupta, V. (2009). Probability of SLA Violation for Semi-Markov Availability [Master's thesis, Ohio University]. OhioLINK Electronic Theses and Dissertations Center. http://rave.ohiolink.edu/etdc/view?acc_num=ohiou1235610777

    APA Style (7th edition)

  • Gupta, Vivek. Probability of SLA Violation for Semi-Markov Availability. 2009. Ohio University, Master's thesis. OhioLINK Electronic Theses and Dissertations Center, http://rave.ohiolink.edu/etdc/view?acc_num=ohiou1235610777.

    MLA Style (8th edition)

  • Gupta, Vivek. "Probability of SLA Violation for Semi-Markov Availability." Master's thesis, Ohio University, 2009. http://rave.ohiolink.edu/etdc/view?acc_num=ohiou1235610777

    Chicago Manual of Style (17th edition)

ohiou1235610777
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© 2009, all rights reserved.
This open access ETD is published by Ohio University and OhioLINK.