Definition
Capacity management is the process of ensuring that an IT system has sufficient resources to meet current and future performance demands. It involves monitoring, analyzing, and adjusting resource utilization like CPU, memory, storage, and network bandwidth. This proactive approach prevents performance bottlenecks and ensures a smooth user experience. Capacity management works by forecasting future needs based on historical data and business growth projections, then procuring or reallocating resources accordingly. It matters on the job because it directly impacts system availability, user satisfaction, and operational costs, preventing expensive overprovisioning or frustrating underprovisioning. For example, a cloud provider uses capacity management to ensure enough virtual machines are available to handle anticipated spikes in website traffic during a major sale. This differs from performance tuning, which focuses on optimizing existing resources rather than ensuring their availability. Capacity management concepts are relevant to domains like IT Operations and Cloud Computing, appearing in certifications such as AWS Certified Solutions Architect Associate.