Build The Capacity Model Before The Crisis
Build a simple IT service capacity model that connects business demand, service behavior, and component limits.
A useful capacity model connects what the business is doing to what users feel and what the platform can actually absorb. The three-layer view ITIL's capacity and performance lens is useful because it prevents a narrow infrastructure answer. Start with business demand: launches, campaigns, batch windows, active users, orders, requests, or data volume. Then name the service behavior users care about: latency, availability, throughput, freshness, or completion time. Only then look at component resources: CPU, memory, storage, I/O, queue depth, thread pools, connection pools, or third-party limits. Why this works Capacity incidents often happen between layers. A component can look…
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