From VMware site:
VMware vCenter CapacityIQ is a value-add component of the VMware vCenter family of management solutions, providing capacity management capabilities for virtualized datacenter or desktop environments. CapacityIQ integrates seamlessly with VMware vCenter Server, ensuring that your virtualized infrastructure capacity is always predictable and efficiently used.
VMware vCenter CapacityIQ balances business demand with IT
supply, without compromising performance, availability and security. With
CapacityIQ, your IT infrastructure is guaranteed to have sufficient capacity to
meet any business service level agreements. IT organizations can leverage
VMware vCenter CapacityIQ in a number of scenarios, including:
Cost avoidance and justification. Do more with the same or less! Optimize utilization of existing hardware resources or justify any new business purchases.
Availability and risk mitigation. Plan for potential business and service disruptions proactively by modeling the impact of an outage, failure or disaster.
Project planning and decision-making. Model the effect of one-time
strategic business changes. Quantify the results of workload consolidations,
company acquisitions, additional new headcounts or deployment of multi-tiered