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Cloned from launchpad blueprint https://blueprints.launchpad.net/nova/+spec/vm-ensembles. Description: This document introduces the concept of a VM ensemble or VM group into Nova. An ensemble will provide the tenant the ability to group together VMs that provide a certain service or part of the same application. More specifically it enables configuring scheduling policies per group. This will in turn allow for a more robust and resilient service. Specifically, it will allow a tenant to deploy a multi-VM application that is designed for VM fault tolerance in a way that application availability is actually resilient to physical host failure. https://docs.google.com/document/d/1bAMtkaIFn4ZSMqqsXjs_riXofuRvApa--qo4UTwsmhw/edit Specification URL (additional information): https://docs.google.com/document/d/1bAMtkaIFn4ZSMqqsXjs_riXofuRvApa--qo4UTwsmhw/edit