Page 956 - Cloud computing: From paradigm to operation

6 Monitoring

The layering framework is shown schematically in Figure 6-1.

Figure 6-1 – Cloud computing layering framework

The function of each layer in the framework is described in clause 9.2.1 of [ITU-T Y.3502].
Figure 6-2 presents a high-level overview of the cloud computing reference architecture functional
components organized by means of the layering framework.

The relevant monitoring functional components are as follows.
– Resource abstraction and control functional component: the resource abstraction and control
functional component which resides in the resources layer enables control functionality, enabling
monitoring and management capabilities implemented in the operational support systems
functional component.
Monitoring and reporting functional component: the monitoring and reporting functional component that is
one of the multilayer operational support systems provides capabilities for the following.
– Monitoring the activities of other functional components throughout the cloud provider's system.
This includes the functional components that are involved in the direct use of cloud services by
customer cloud service users such as service access and service implementation (e.g., the invocation
of cloud service operation by a particular user). This also includes functional components involved
in the support of cloud services, such as functional components in the operational support system
(OSS) itself, like the service automation functional component (e.g., the provisioning of a service
instance for a particular customer).
– Providing reports on the behaviour of the cloud service provider's system, which may take the form
of alerts for behaviour that has a time-sensitive aspect (e.g., the occurrence of a fault, the
completion of some task) or may take the form of aggregated forms of historical data (e.g., service
usage data).

– Storage and retrieval of monitoring and event data as logging records.
Service level management functional component: the service level management functional component,
which also resides in the operational support systems, obtains monitoring information from the monitoring
and reporting functional component in order to measure and record key performance indicators (KPIs) for
the cloud service. Capacity is allocated or de-allocated based on the basis of these KPIs.

The details of the functional components are described in clause 9.2 of [ITU-T Y.3502].

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