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Availability-Aware Virtual Resource Provisioning for Infrastructure Service Agreements in the Cloud

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Abstract

Service availability is a key construct in Service Level Agreements (SLA) between a cloud service provider and a client. The provider typically allocates backup resources to mitigate the risk of violating the SLA-specified uptime guarantee. However, initial backups may need to be adjusted in response to real-time failure and recovery events. In this study, we first develop a recurrent intervention at fixed intervals (RIFI) strategy that allows the provider to adjust the allocation of backup resources such that the expected total cost is minimized. Next, we focus on the limit to number of interventions, starting from single intervention strategy, as frequent reallocations may be operationally disruptive. Particularly, we provide a cost minimization approach to guide the service providers in their virtual resources management, and a specific downtime minimization approach for more mission-critical applications as a more aggressive alternative. We present computational results exploring the impact of intervention on the likelihood of SLA violation for the rest of the contract period, and evaluate parameters such as time and quantum of resource level adjustment, penalty levels desired by clients, and their influences on the backup resource provisioning strategies. We also validate our models through the analysis of use cases from Amazon Elastic Compute Cloud. Finally, we summarize this study by providing key practical managerial implications for resource deployment in the availability-aware cloud.

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Notes

  1. https://aws.amazon.com/ec2/dedicated-hosts/pricing/

  2. http://technet.microsoft.com/en-us/library/bb740891.aspx

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Authors and Affiliations

  1. Department of Finance, Operations, and Information Systems, Goodman School of Business, Brock University, St. Catharines, Ontario, L2S 3A1, Canada

    Shuai Yuan

  2. Department of Management Science and Systems, School of Management, University at Buffalo, State University of New York, Buffalo, New York, 14260, USA

    Sanjukta Das & Ram Ramesh

  3. Department of Computer Science and Engineering, School of Engineering and Applied Sciences, University at Buffalo, State University of New York, Buffalo, New York, 14260, USA

    Chunming Qiao

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  1. Shuai Yuan
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  2. Sanjukta Das
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  3. Ram Ramesh
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  4. Chunming Qiao
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Correspondence to Shuai Yuan.

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Yuan, S., Das, S., Ramesh, R. et al. Availability-Aware Virtual Resource Provisioning for Infrastructure Service Agreements in the Cloud. Inf Syst Front 25, 1495–1512 (2023). https://doi.org/10.1007/s10796-022-10302-4

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