Figure 6.3 shows the inputs to, the sub-processes within and the outputs from the Capacity Management process.
Figure 6.3 – The Capacity Management Process
There are a number of sources of information that are relevant to the Capacity Management process. Some of these are as follows:
Capacity Managment consists of a number of sub-processes, of which there are various activities. The sub-processes of Capacity Managment are:
Business Capacity Managment: This sub-process is responsible for ensuring that the future business requirements for IT Services are considered, planned and implemented in a timely fashion. This can be achieved by using the existing data on the current resource utilization by the various services to trend, forecast or model the future requirements. These future requirements come from business plan outlining new services, improvements, and growth in existing services, development plans etc.
Service Capacity Managment: The focus of this sub-process is the management of the performance of the live, operational IT Services used by the Customers. It is responsible for ensuring that the performance of all services, as detailed in the targets in the SLAs and SLRs, is monitored and measured and that the collected data is recorded, analyzed and reported. As necessary, the action is taken to ensure that the performance of the services meets the business requirements. This is performed by staff with knowledge of all the areas of technology used in the delivery of end-to-end service and often involves seeking advice from the specialist involved in Resource Capacity Mangement.
Resource Capacity Managment: The focus in this sub-process is the management of the individual components of the IT Infrastructure. It is responsible for ensuring that all components within the IT Infrastructure that have finite resource are monitored and measured and that the collected data is recorded, analyzed and reported. As necessary, action must be taken to manage the available resource to ensure that the IT Services that it supports meet the business requirements. In carrying out this work, the Capacity Managment process is assisted by individuals with specialist knowledge in the particular areas of technology.
The activities that are carried out by the sub-processes are described in Section 6.3. Each of the subprocesses carries out many of the same activities, but each sub-process has a very different focus. Business Capacity Management is focused on the current and future business requirements, while Service Capacity Managment is focused on the delivery of the existing services that support the business and Resource Capacity Managment is focused on the technology that underpins all the service provision.