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Triggers, inputs, outputs and interfaces. There are many triggers that will initiate Capacity Management activities



There are many triggers that will initiate Capacity Management activities. These include:

  • Service breaches, capacity or performance events and alerts, including threshold events
  • Exception reports
  • Periodic revision of current capacity and performance and the review of forecasts, reports and plans
  • New and changed services requiring additional capacity
  • Periodic trending and modelling
  • Review and revision of business and IT plans and strategies
  • Review and revision of designs and strategies
  • Review and revision of SLAs, OLAs, contracts or any other agreements.

There are a number of sources of information that are relevant to the Capacity Management process. Some of these are as follows.

4.3.6.1 Inputs

  • Business information: from the organization’s business strategy, plans and financial plans, and information on their current and future requirements.
  • Service and IT information: from Service Strategy, the IT strategy and plans and current budgets, covering all areas of technology and technology plans, including the infrastructure, environment, data and applications, and the way in which they relate to business strategy and plans.
  • Componentperformance andcapacityinformation: of both existing and new technology, from manufacturers and suppliers.
  • Serviceperformanceissues: the Incident and Problem Management processes, with incidents and problems relating to poor performance.
  • Service information: from the SLM process, with details of the services from the Service Portfolio and the Service Catalogue and service level targets within SLAs and SLRs, and possibly from the monitoring of SLAs, service reviews and breaches of the SLAs.
  • Financial information: from Financial Management, the cost of service provision, the cost of resources, components and upgrades, the resultant business benefit and the financial plans and budgets, together with the costs associated with service and component failure. Some of the costs of components and upgrades to components will be obtained from procurement, suppliers and manufacturers.
  • Change information: from the Change Management process, with a Change Schedule and a need to assess all changes for their impact on the capacity of the technology.
  • Performance information: from the Capacity Management Information System (CMIS) on the current performance of both all existing services and IT infrastructure components.
  • CMS: containing information on the relationships between the business, the services, the supporting services and the technology.
  • Workloadinformation: from the IT Operations team, with schedules of all the work that needs to be run, and information on the dependencies between different services and information, and the interdependencies within a service.

4.3.6.2 Outputs



The outputs of Capacity Management are used within all other parts of the process, by many other processes and by other parts of the organization. Often this information is supplied as electronic reports or displays on shared areas, or as pages on intranet servers, to ensure the most up-to-date information is always used. The information provided is as follows:





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