PEM automatically collects a wide range of performance metrics about storage usage, memory usage, I/O traffic and more. The performance metrics are stored in a metadata repository that is created when PEM is installed.The hard part of capacity planning operations (automatic data collection) is transparently handled for you by PEM.All that remains is to use PEM’s Capacity Manager interface to build desired trend analysis and forecasting reports.Of course, you have full control over what and how often data is collected, but you can also take advantage of the product’s defaults and have the recommended statistics gathered for you automatically.To open the Capacity Manager dialog, select Capacity Manager… from the Management menu. The Capacity Manager dialog (shown in Figure 7.1) provides quick access to a list of the available metrics, and the options for producing capacity planning reports.The Capacity Manager dialog displays two tabs – Metrics and Options – that you can use to define capacity planning reports.The Metrics tab displays a tree control that allows you to easily navigate all of your managed servers and select statistics that you wish to analyze. For example, to follow the growth of a particular database, you would expand that node in the tree control, highlight Database Size in the listed Metrics, and click the Add >> button to add it to the Selected metrics pane.Capacity Manager can plot multiple statistics on one graph or produce a separate graph for each distinct metric. A checkbox located in the lower right corner of the Metrics tab of the Capacity Manager dialog enforces this option.When you have specified the metrics that will be included in the analysis, you can then specify the timeframe over which the analysis will be performed. Use the fields on the Options tab of the Capacity Manager dialog, to specify the Time Period covered by the report (see Figure 7.2).Capacity Manager allows you to create both graphical and tabular reports for historical trend analysis and future forecasts analysis reports. The Options tab provides fields that allow you to specify the form that the resulting report will take:
• Finally, you can specify where Capacity Manager reports are displayed or written (see Figure 7.2). PEM will display the report in either a new or existing tab within the PEM client or write the report to a file on the host of your client workstation.Specify a Report destination, and click the Generate button to generate the report, as shown in Figure 7.3.