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Abstract Execution of critical services traditional Execution of critical services traditionally requires multiple distinct replicas, supported by independent networks and hardware. To operate properly, these services often depend on the correctness of a fraction of replicas, usually over 2/3 or 1/2. Defying the ideal situation, economical reasons may tempt users to replicate critical services onto a single multi-tenant cloud infrastructure. Since this may expose users to correlated failures, we assess the risks for two kinds of majorities: a conventional one, related to the number of replicas, regardless of the machines where they run; and a second one, related to the physical machines where the replicas run. This latter case may exist in multi-tenant virtualized environments only.To assess these risks, under crash and Byzantine failures of virtual and physical machines, we resort to theoretical and experimental evaluation. Contrary to what one might expect, we conclude that it is not always favorable to distribute replicas evenly over a fixed number of physical machines. On the contrary, we found cases where they should be as unbalanced as possible. We systematically identify the best defense for each kind of failure and majority to preserve. We then review the most common real-life attacks on clouds and discuss the a priori placement of service replicas that minimizes the effects of these attacks. at minimizes the effects of these attacks.
Author Filipe Araujo + , Serhiy Boychenko + , Raul Barbosa + , António Casimiro +
Document Document for Publication-Araujo2014JISA.pdf +
Journal Journal of Internet Services and Applications  +
Key Araujo2014JISA  +
Month jul  +
NumPubDate 2,014.07  +
Project Project:TRONE +
ResearchLine Timeliness and Adaptation in Dependable Systems (TADS) +
Title Replica Placement to Mitigate Attacks on Clouds  +
Type article  +
Url  +
Volume 5  +
Year 2014  +
Categories Publication  +
Modification dateThis property is a special property in this wiki. 23 July 2015 01:58:17  +
NumberThis property is a special property in this wiki. 1  +
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