Page 42 - Cloud computing: From paradigm to operation

1 Framework and requirements for cloud computing

Use case
Pre-conditions – ① The CSC has accessed the IaaS service through the CSP portal with an appropriate
(optional) security mechanism.
– ② The CSC has selected the template or configured a specific VM and/or physical host.
– ② The CSC has selected the storage resources, such as block, file and object storage,
then attached them via their computing capabilities or used them directly.
– ② The CSC has selected the network connectivity services, such as the IP address, VLAN,
firewall and load balance and then applied them to the related computing and/or
storage capabilities.
– ② The CSC confirmed the SLAs and charge model with selected computing, storage and
network connectivity services provided by the CSP.
Post-conditions – ③ The CSC manages and monitors computing, storage and network capabilities with
(optional) arbitrary applications.
– ③ The CSP configures, deploys and maintains hypervisors and storage resources.
– ③ The CSP establishes, configures, delivers and maintains network connectivity to the
CSC.
– ③ The CSP provides security infrastructure to the CSC.
Requirements – Configuration, deployment and maintenance of resources
– Use and monitoring of resources

I.3 NaaS general use case

Use case

Name NaaS general use case
Abstract A NaaS CSP sets up, maintains and releases the network connectivity between CSCs and
between the CSP and CSC as a cloud service. This can include on-demand and semi-
permanent connectivity.
Roles CSC, CSP
Figure

Pre-conditions – There is no connectivity between XaaS CSC A and XaaS CSP Y.
(optional) – There is no connectivity between XaaS CSP X and XaaS CSP Y.
– Either XaaS CSC A or XaaS CSP Y requests the connectivity between them with their end-
point identifiers and associated characteristics (referring to QoS and security aspects)
for the connectivity.
– Either XaaS CSP X or XaaS CSP Y requests the connectivity between them with their end-
point identifiers and associated characteristics (referring to QoS and security aspects)
for the connectivity.
Post-conditions – XaaS CSC A and XaaS CSP Y can communicate with each other.
(optional) – XaaS CSC X and XaaS CSP Y can communicate with each other.

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