US Patent 9959157 Computing instance migration

A technology is described for identifying a destination physical host used to host a computing instance modeled on a source computing instance. An example method may include obtaining specifications for a source computing instance in preparation to migrate the source computing instance to a destination physical host. A destination physical host may then be identified for hosting a destination computing instance modeled on the source computing instance, where the destination physical host may have specifications determined to support the destination computing instance. A model of the source computing instance as hosted on the source physical host may be compared with a model of the source computing instance as hosted on the destination physical host to identify any conflicts that may prevent the destination physical host from hosting the destination computing instance.