Page 221 - Cloud computing: From paradigm to operation

Framework and requirements for cloud computing 1

Appendix II

Use cases of the physical machine for cloud computing
(This appendix does not form an integral part of this Recommendation.)

This appendix describes physical machine related use cases.

Table II.1 – Providing IaaS service with processing resource – use case

Title Providing IaaS service with processing resource use case

Description Infrastructure capabilities type, especially for providing VM, which is resided on a physical
machine. The virtual machine provides a virtualized and isolated computing environment for
each guest operating system (OS) with processing, storage, networking and other hardware
resources. Usually a physical machine would carry more than one virtual machine and needs
to provide more virtual CPU than physical CPU, so as the memory and I/O devices.
Furthermore, the physical machine usually provides a management function for the CSP to
manage and monitor the physical machines. The loading information would help the CSP to
select which host to deploy the VMs and the fault location information could help the CSP
easily replace the failure component. As more applications run in one physical machine, the
reliability is required so that it could continue to run and bear the services without migrating
when there are few failures. As some applications may require some other hardware
components with special features, the physical machine would have to reserve one or more
extended interfaces for adding cloud resources. To improve the VM's performance, the
physical machines usually use CPUs with virtualization instruction set support. For situations
with a lot of network traffic processing, physical machines can offload traffic processing to
I/O devices to improve performance and reduce the load of CPUs.
Roles/sub-roles CSP: cloud service operations manager

Figure

Pre-conditions The virtual machine resides on the physical machine.
(optional)
Post-conditions CSP: cloud service operations manager wants to build or expand a resource pool to provide
(optional) VM service.

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