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In this context, cloud computing has become an interesting alternative for implementing disaster tolerant services due to its resource on\u2010demand and pay\u2010as\u2010you\u2010go models. This paper proposes a sensitivity analysis approach to assess the parameters that most impact the availability of cloud data centers, taking into account disaster occurrence, hardware and software failures, and disaster recovery mechanisms for cloud systems. The analysis adopts continuous\u2010time Markov chains, and the results indicate that disaster issues should not be neglected. Hardware failure rate and time for migration of virtual machines (VMs) are the critical factors pointed out for the system modeled in our analysis. Moreover, the location where data centers are placed has a significant impact on system availability, due to time for migrating VMs from a backup server.<\/jats:p>","DOI":"10.1002\/nem.2040","type":"journal-article","created":{"date-parts":[[2018,7,19]],"date-time":"2018-07-19T08:22:50Z","timestamp":1531988570000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":4,"title":["Sensitivity analysis of an availability model for disaster tolerant cloud computing system"],"prefix":"10.1002","volume":"28","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-0551-8445","authenticated-orcid":false,"given":"Bruno","family":"Silva","sequence":"first","affiliation":[{"name":"Center for Informatics Federal University of Pernambuco Recife Pernambuco Brazil"}]},{"given":"Rubens","family":"Matos","sequence":"additional","affiliation":[{"name":"Center for Informatics Federal University of Pernambuco Recife Pernambuco Brazil"}]},{"given":"Eduardo","family":"Tavares","sequence":"additional","affiliation":[{"name":"Center for Informatics Federal University of Pernambuco Recife Pernambuco Brazil"}]},{"given":"Paulo","family":"Maciel","sequence":"additional","affiliation":[{"name":"Center for Informatics Federal University of Pernambuco Recife Pernambuco Brazil"}]},{"given":"Armin","family":"Zimmermann","sequence":"additional","affiliation":[{"name":"System and Software Engineering Technical University of Ilmenau Ilmenau Thuringer Germany"}]}],"member":"311","published-online":{"date-parts":[[2018,7,18]]},"reference":[{"issue":"2","key":"e_1_2_7_2_1","first-page":"705","article-title":"Evaluation of network resilience, survivability, and disruption tolerance: analysis, topology generation, simulation, and experimentation","volume":"52","author":"Sterbenz J","year":"2013","journal-title":"Telecommun Syst"},{"key":"e_1_2_7_3_1","unstructured":"MillerR.Car crash triggers amazon power outage:Data Center Knowledge.2010.http:\/\/www.datacenterknowledge.com\/archives\/2010\/05\/13\/car-crash-triggers-amazon-power-outage\/. 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