Physical machine is a type of computing machine to provide physical resources. Since all cloud services have to reside and operate on physical machines, it is important for the cloud service providers as well as the manufacture to identify specific functional requirements of the physical machine. This Recommendation provides the introduction of physical machine with physical machine components, physical machine types, virtualizations in physical machine as well as the scalability of components in physical machine. Also, the Recommendation provides functional requirements for physical machine derived from various use cases are described in Appendix. The relationship with other related specifications developed in other SDOs has also been introduced as Appendix.