Stress is a measurement of the workload on an object over time, including CPU, memory, network I/O, and datastore I/O. You can turn on and configure the settings for the Stress element for the object types in your policy so that you can override the settings and have vRealize Operations Manager analyze the resources used for an object or object group over a period of time, and report the historical workload based on your settings.

How the Stress Element Works

The Stress element determines how vRealize Operations Manager reports on the demand for resources and usable capacity over time.

  • When you include the Stress element in your policy, you can use the stress score to identify hosts and machines that require additional resources, and identify hosts that require fewer virtual machines, so that you can avoid performance problems in your environment.

  • When you select Peak Consideration in the Capacity & Time Remaining element, vRealize Operations Manager can use the Stress element to account for peaks in capacity usage.

  • Stress is the percentage of demand over time, where stress extends above the stress noise line. For example, the stress line might be 70 percent of the percentage of workload over time, based on the setting used for exceeding the demand. As vRealize Operations Manager calculates capacity and time remaining, you might want to account for these spikes and peaks.

    To set the stress settings, use the sliding analysis settings. The settings for stress might need to differ between policies used to monitor your infrastructure versus virtual machines. For example, for an infrastructure policy, your recommended levels for the stress settings might be 10 (warning), 30 (immediate), and 50 (critical). For virtual machines, the settings might be 5 (warning), 10 (immediate), and 20 (critical). For a test and development policy, you might want vRealize Operations Manager to trigger an alert when the level reaches 10 percent. For a production policy, you typically want to ensure that sufficient capacity exists for peak use.

Where You Override the Policy Stress Element

To view and override the policy Stress analysis setting, in the menu, click Administration, and then in the left pane click Policies. Click the Policy Library tab. Click the Add New Policy icon to add a policy or click the Edit Selected Policy icon to edit a policy. In the Add or Edit Monitoring policy workspace, click Analysis Settings, then select one or more objects in the left pane. The stress settings for the object types that you selected appear in the right pane.

View the Stress policy element, and configure the settings for your policy.

If you do not configure the policy element, your policy inherits the settings from the selected base policy.

Table 1. Policy Stress Element Settings in the Add or Edit Monitoring Policy Workspace

Option

Description

Lock icon

Enables you to override the policy element settings so that you can customize the policy to monitor the objects in your environment.

Symptom Thresholds for Time Remaining Score and Capacity Score

Set the symptom threshold values for the policy element to levels that update the badge scores to meet the criteria for your environment. vRealize Operations Manager uses the symptom threshold values to trigger alerts that appear in the Alerts Overview and Dashboard scores.

In the menu, click Environment, and then from the left pane select an object. Click Analysis > Stress to view the badge score symptom thresholds for Stress policy settings for a selected object, as defined in the policy applied to the object.

Stress settings for resource containers

Displays the resource container and settings for exceeding the demand during the time range defined in the policy Time element.

In the menu, click Environment, and then from the left pane select an object. Click Analysis > Stress to view the percentage for exceeding demand for a selected object, as defined in the applied policy.

The Sliding Analysis Window defines the time period that vRealize Operations Manager checks for stress, which occurs at the defined range of minutes, or during the entire range defined for the data range in the Time policy element, to monitor for peak stress periods. To modify the setting, select the resource container setting, such as Disk Space > Usage, double-click the Sliding Analysis Window setting, and select either Any or Entire Range. When the setting is Any, you can modify the Minute Peak value to an interval in minutes for vRealize Operations Manager to monitor your objects and report on peak times of stress.