PCFE and Green Areas of Opportunity 307
growth plans, current activity, and past trends can help you formulate
future upgrade and capacity needs.
Use the information from the assessment, considering inventory,
growth plans, and previous usage information, to put together a forecast.
The forecast can be as simple as taking current usage (space and perfor-
mance), assuming that current response-time objectives are being met, and
applying growth factors to them. Of course, a capacity plan and forecast can
be much more sophisticated, relying on detailed models and analysis main-
tained by in-house or external sources. The level of detail will vary depend-
ing on your environment and specific needs. The tricky part, which has
resulted in capacity planning ...