Page 230 - Cloud computing: From paradigm to operation

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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