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Tuesday, March 13, 2012

The Capacity Plan

In the previous two chapters, we learnt what capacity management is and the goals & objectives of that process. As you might have guessed by now, this cannot be achieved without a plan of Action. This plan is named as “Capacity Plan

Capacity Plan:

The Capacity Plan is a key output of this process because it predicts and costs the impact of new and changing business plans on the current IT environment.

This provides IT management with a reliable forecast to support decisions necessary to maintain service stability and achieve the balances described in the Introduction to this chapter. The plan is usually produced annually and synchronized to IT financial planning. Updates may be routinely produced once or twice a year or in response to unexpected changes and new requirements.

The accuracy of the plan relies on the level of understanding of the utilization and capacity of the components supporting the services and the ability to predict their impact on service performance when the demand on them changes. This in turn is dependent on accurate configuration information and the ability to model the interaction between components and workload.

Some organizations base their plan on a simple extrapolation of current usage with little or no reference to business activities or plans. What has happened in the past is not necessarily a useful guide to what might happen in the future.

So, the key point to remember here is that, accurate data usage while formulating the capacity plan is of paramount importance. After all, a plan is only as good as the data that went into its creation.

Prev: Goals, Purpose & Objectives of Capacity Management

Next: Sub-Processes of Capacity Management

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