6.3

To modify the stress score thresholds, edit the policy that applies to your objects, and click Analysis
. Select an object type and click the lter icon to display the policy analysis seings. In the Stress
area, click the lock icon, expand Stress, and modify the stress thresholds.
In the analysis stress seings, vRealize Operations Manager uses the selected resources, such as Memory
Demand, CPU Demand, and vSphere Conguration Limit to calculate the stress score.
You can set the stress thresholds to your own values, or turn them o. To change a stress score threshold,
click and drag an icon along the slider. To remove a scoring range, such as the default range of 35–49
identied by orange, double-click an icon to disable the range.
Demand Exceeds is a percentage of capacity. Capacity is also called provisioned capacity. To change the
stress threshold for a resource, double-click the Demand Exceeds percentage, and enter the desired value.
This value denes the point at which vRealize Operations Manager considers the percentage of demand to
be stress. For example, to change the stress threshold for Memory Demand, double-click the current
percentage, such as 70.0 % of capacity, and enter the new percentage of demand to exceed for
vRealize Operations Manager to identify stress.
For each resource, you can change the sliding analysis window value to include the entire range, and set the
peak value to a dierent time depending on how you need vRealize Operations Manager to derive the stress
score.
More About the Stress Score
vRealize Operations Manager calculates the stress zone and stress score for you. The following explanations
cover typical scenarios where Demand does not exceed Capacity.
To determine the stress on an object for a specic time period, you can examine the demand curve to
determine how much of the stress zone the demand occupies. The stress zone is typically where demand
exceeds 70 percent of the total capacity. For example, stress occurs when CPU demand, memory demand, or
memory consumed exceeds 70 percent of the capacity.
In a 60-minute peak period, vRealize Operations Manager bases the Stress score calculation on the following
variables:
n
Stress threshold, which is the Demand Exceeds seing
n
Stress score threshold, which determines the color of the Stress badge
n
Time range, as in 30 days of analysis
n
Peak detection window, which is the 60-minute peak seing that you can adjust to either a non-zero
number of minutes or the entire range.
When the demand exceeds 70 percent, that data point in time is in the Stress zone.
Chapter 2 Planning the Capacity for Your Managed Environment Using vRealize Operations Manager
VMware, Inc. 77