4.3 Capacity Management

What is it?

Capacity management entails knowing what you have and being in control of what the capacity need is for the near future. On the basis of this data, capacity can be procured on a “just in time” principle. The consequences of this process are far reaching, but then so are the rewards. Fully implemented capacity management can drive asset utilization to much higher levels, with consequently much lower costs for hardware, software and energy. Business structures may however prevent effective capacity management through budget structures and book keeping practices.

Why should you care?

Primarily capacity measurements are required to understand the utilization of the IT and data center. In many cases, IT utilization can be linked to power usage. You have to able to answer these three questions for power, cooling, compute, racks, storage and networking:

  • Current capacity in use
  • Maximum capacity available
  • Future capacity demand

The ultimate is to be able to do capacity management on all available assets and CIs up to the services that are delivered to this business, and this requires input from the management infrastructure (what is being used, when and how much), the asset management process (what is the available capacity) and also the service level management process (what is needed/guaranteed).

Without capacity management you drive blind because you have no clue why you have the capacity installed, and whether this capacity is sufficient or over-sufficient.

How does it relate to the other items in the model?

This KPI is the process view to all KPIs in the second ( IT Assets) and third ( Management) quadrants.