Modern Cloud infrastructures are built leveraging thousands of highly distributed servers, used to provide services directly to customers over the Internet. The service provider has two extremely important objectives, which, unfortunately, are to some degree contrasting: a) ensure continuous availability of the Cloud service, and b) contain the cost of the infrastructure and administration (CAPEX and OPEX). There are several factors that have an impact on the availability of services, mostly related to infrastructure failures. Failures are not... [More]

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