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1                                    Framework and requirements for cloud computing




                              Table II.8 – Configurations of clustering processing units – use case
             Post-conditions    Physical machines can run a cloud service efficiently and elastically according to the desired
             (optional)         performance.
             Derived            –   Configuration of multiple processing units (see clause 7.1.5)
             requirements       –   Multiple CPUs (see clause 7.1.1.1)
                                –   Adding processing units (see clause 7.4)
                                –   Adding sub-components of processing units (see clause 7.4)
                                –   Network topology (see clause 7.1.5)
                                –   Interconnect network supports (see clause 7.1.5)
                                –   Device driver and API supports (see clause 7.2)



                              Table II.9 – Replacing components of a physical machine – use case

             Title              A use case of replacing components of physical machine
             Description        This use case covers the situation where components of physical machine be replaced. After
                                deployment and operation, a component of physical machine may need to be replaced with
                                another new one due to component failure. In addition, a component could be replaced with
                                component of other model to upgrade the performance.
                                Typically, physical machine should support replacement of the main components, including
                                CPU, memory, storage, power supply and cooling component.
             Roles/sub-roles    CSP: cloud service operations manager
             Figure















                                To support replacement, the components are not coupled to the physical machine so that
                                the components can be installed or uninstalled dynamically. Typically, the components are
                                designed to follow certain specifications to ensure compatible interface and shape.
             Pre-conditions     CSP wishes to replace some components of physical machines to fix components failure or
             (optional)         upgrade components.
             Post-conditions    Physical machine can runs normally with the new components.
             (optional)
             Derived            –   CPU replacement (see clause 7.1.1.1)
             requirements       –   Memory replacement (see clause 7.1.1.2)
                                –   Storage replacement (see clause 7.1.1.3)
                                –   Processing unit replacement (see clause 7.4)
                                –   Equipment for mounting and removal (see clause 7.1.4)
                                –   Power supply replacement (see clause 7.1.2)
                                –   Cooling component replacement (see clause 7.1.3)






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