A project scenario is a simulation about how capacity changes when you change the conditions to forecast the upcoming capacity to your virtual infrastructure. Project scenarios do not make the actual changes to objects in your environment. But when you implement the scenario, you can determine the capacity requirements before you must change your environment.

Where You Add Scenarios

To add a scenario to a project, or to update a scenario in an existing project, click Environment in the left pane, select an object, and click the Projects tab. On the Projects toolbar, click the plus sign to add a project, or click an existing project and click the pencil to edit the project. In the Projects workspace, click Scenarios.




From the drop-down menu, double-click an object to select it or use the filter to find an object. The selected object determines the content of the projects scenario list.

List of scenarios

To add the scenario to the project, drag a scenario to the Scenarios area.

When you add, edit, or remove a project scenario, to view your changes in the visualization chart click Save project and continue editing.

Capacity Container

From the drop-down menu, select a container for this scenario.

Use the Capacity Container drop-down menu to select a container for this project. The container options change depending on the object you select. For example, for a cluster, you can forecast capacity according to most constrained, memory or CPU demand, a vSphere configuration limit, disk space allocation, or disk space demand.

Visualization Chart

The visualization chart, which displays stress-free demand and usable capacity, includes other metrics in addition to the metrics that you modify. As a result, the magnitude of the change in capacity might not scale proportionally to your input.

The what-if visualization chart uses average hourly data. The Current Values settings in the project configuration reflect the latest 5-minute data points. For example, the Current Values settings appear in the scenarios named change absolute capacity and change absolute demand.

For a metric, a large variance can occur between the average hourly data and the latest data point. When you change a value according to the latest data point, the visualization chart displays the change according to the hourly average.

For example, the memory demand hourly average is 35 GB, but the latest data point in Current Values in the project configuration dropped to 3.5 GB. You can use the Change by Absolute scenario to change the demand to 7 GB, with the intent to double the demand. In this case, the visualization chart renders this change as a drop in demand from its average of 35 GB.


Configure the following information.

  • Scenario Name

  • Scenario Description. A meaningful description of the scenario.

  • Implementation Date. The date and time to implement the scenario.

  • Configuration area. Depending on the scenario, configure the global value, or customize the metrics and metric values. The Changes area varies depending on the scenario that you configure. If you add a scenario to a virtual machine or host object, you can populate the metrics from an existing object or from a custom profile.

For example, to apply to the capacity calculations when you configure the Add Demand: add Virtual Machine scenario, you can click Populate metrics from. You copy the metric values from a predefined profile or from an existing object. When you copy the metric values from an existing object, you can either use the most recent metric values or a historical demand pattern from another virtual machine.