Page 653 - Cloud computing: From paradigm to operation

XaaS 3

User layer

Access layer

Service IaaS
layer (Computing/storage/network)

Physical/virtual resources
Resource
layer (Processing, storage
and networking)

Y.3513(14)_F6-1

Figure 6-1 – High level concept of IaaS

An IaaS instance can be configured by the CSC using a template to define the set of parameters stating, how
infrastructure resources are organized. Such IaaS instance consists of configured processing, storage or
networking resources, as well as information located in the resources, which may include cloud service
provider data, cloud service customer data or both.
IaaS cloud service provider (CSP) also provides business and administration capabilities to CSC, which are
common capabilities for cloud services. The functional requirements of business and administration
capabilities are for further study.

NOTE – Regarding the network connectivity, one important difference between IaaS and Network as a Service (NaaS) is
that IaaS is a cloud service category that is offered in only one flavour of cloud capability type, and that is infrastructure
capabilities type [ITU-T Y.3500]. However, NaaS is a cloud service category that can be offered in all three cloud
capabilities types.

7 Functional requirements
– It is recommended that IaaS CSP provides to the CSC IaaS functions, such as a composition of
processing, storage, and networking resources with service logic, specific service level agreements
(SLAs) and charging model.

– It is required that IaaS CSP provides the CSC with operations handling mechanisms related to
provisioned infrastructure resources, such as assign, modify, query and release.

– It is recommended that IaaS CSP provides status information about the infrastructure in response
to queries from the CSC.
NOTE – The status information includes, but not limited to, available, reserved and in-use.
– It is recommended that IaaS CSP provides template to the CSC, related to instantiation of
infrastructure, which allows to provision processing, storage and networking resources that could
be implemented based on the configuration.
– It is recommended that IaaS CSP provides the CSC with operations handling mechanisms related to
infrastructure templates to allow modification of infrastructure, such as upload, update, disable,
enable, query or release.

7.1 Computing service functional requirements

– It is required that IaaS CSP provides computing functions with specific SLAs and charging model to
the CSC.

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