What is ITIL Capacity Management

Capacity Management is one of five components in the ITIL Service Delivery area. The work is proactive rather than reactive in nature and is responsible for ensuring that business needs and service definitions are fulfilled using a minimum of computing resources.
Capacity Management activities include:

• Monitoring, analyzing, tuning, and implementing necessary changes in resource utilization
• Managing demand for computing resources, which requires an understanding of business priorities
• Modeling to simulate infrastructure performance and understand future resource needs
• Application sizing to ensure required service levels can be met
• Storing capacity management data
• Producing a capacity plan that documents current utilization and forecasted requirements, as well as support costs for new applications or releases
• Building the annual infrastructure growth plan with input from other teams