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Hi all, I have been working on a scheme for delivering highly available services (subject to performance constraints such as response time) using AWS spot instances. The proposal relies on two components: (i) a price prediction model aimed at determining the lowest limit price to bid in order to achieve a given level of availability (e.g., 99.999%); and (ii) a dynamic policy for server allocation and admission control based on estimates of traffic parameters. An overview of the model is described here http://cloud-computing-economics.com/business-benefits-applications/delivering-reliable-services-spot-instances/ while more details are reported here http://math.ut.ee/~mazzucco/papers/hpcc_2011.pdf