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Gandi.net is a cloud provider running about 10000 VMs since 2008. We recently updated our infrastructure from Xen 4.1 to Xen 4.8 and decided to move all of our platform to Xen (from a mix of Xen and KVM). This plaform uses home-made code based on Xen python bindings and xl to orchestrate VMs. This talk will present our use cases and the experience we had with Xen, the shortcomings or issues we had while upgrading our platform, what features we use, and present some new features we would like to have in Xen. For example, it will discuss how we use live patching and live migration. The talk will consider both the Xen hypervisor and its associated userspace utilities.