Page 610 - Cloud computing: From paradigm to operation

3 XaaS

Appendix II

Relationship between DaaS functions and functional components in cloud
computing reference architecture

(This appendix does not form an integral part of this Recommendation.)

Table II.1 provides the relationship between DaaS functions in clause 7 and functional components of cloud
computing reference architecture defined in [ITU-T Y.3502] by enumerating all the related functional
components corresponding to DaaS functions. The term "related functional components" in this appendix
means that the description of the functional component in [ITU-T Y.3502] is similar to that of the DaaS
function but does not mean that the functional component in [ITU-T Y.3502] can replace or cover for the
DaaS function.

Table II.1 – Relationship between Clause 7 DaaS functions and
ITU-T Y.3502 reference architecture

DaaS Keywords or simple Related functional Notes
functions descriptions components (FCs)
in [ITU-T Y.3502]

Platform Virtualization Resource layer- Resource abstraction and control FC includes
virtualization Resource abstraction software elements such as hypervisors, virtual
and control machines, virtual data storage, and time-
sharing.
Platform and virtualization management FC
provides the capabilities for virtualizing the use
of those resources (e.g., by means of
hypervisors).
Resource Resource assignment Resource layer- Resource abstraction and control FC provides
assignment Resource abstraction access to the physical computing resources
and control through software abstraction.
Performance Performance Resource layer- Physical resources include hardware resources,
enhancement enhancement Physical resources such as computers (CPU and memory), networks
for (routers, firewalls, switches, network links and
virtualization network connectors, storage components (hard
platform disks) and other physical computing
infrastructure elements.
Delivery Delivery of virtual Access layer- Delivery of virtual desktop means access of
protocol desktop Service access service. Service object is a virtual desktop in
processing DaaS.
Client Coordinating delivery Access layer- Connection management FC provides
connection protocol Connection enforcement of QoS policies regarding the
management Connection management traffic from and/or to the user layer. This is
monitoring, related with connection monitoring,
reconnections reconnection on the DaaS side.
User access Validating a DaaS user Access layer- Validating a DaaS user and secure access are
management Support secure access Access control tightly associated with the access control FC and
the authentication and identity management FC.

Provisioning Preparing SW, HW None There is no FC specialized in virtual desktop
and allocation resource matters as the provisioning function in
of virtual Configure the pre- [ITU-T Y.3502] is for service.
desktop configured virtual
desktop environment

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