Capacity
According to ITIL, Capacity can be defined as "The maximum throughput that a configuration item or IT service can deliver. For some types of CI, the capacity may be the size or the volume - for example, a disk drive".
Capacity Management can be defined as "The process responsible for ensuring that IT service capabilities and IT infrastructure are able to meet agreed capacity and performance requirements in a timely and cost-effective manner".
Capacity and Performance Management considers all the resources needed to deliver an IT service and addresses the attendance of current and future capacity and performance needs of the business".
4biz can help with this process with many different reports with information related to the capacity of your services. This section contains documents related to the configuration and use of this information.