5.6

Example: Oversized and Undersized Virtual Machine Global Settings
The following examples show how some of the settings are used.
% oversized threshold
If the threshold is 70 percent, a virtual machine that has an average capacity
use of 60 percent is considered oversized. A virtual machine with an average
capacity use of 75 percent is not oversized.
% undersized threshold
If the threshold is 10 percent, a virtual machine that has an average capacity
use of 8 percent is considered undersized. A virtual machine with an average
capacity use of 45 percent is not undersized.
Modify the Criteria for Underused and Stressed Capacity
Underused and stressed capacity settings help you identify the load on clusters and hosts before you deploy
virtual machines.
An administrator can modify any policy in vCenter Operations Manager at any time. The changes that the
administrator applies affect all users. Therefore, the administrator must notify the users who are working with
vCenter Operations Manager about any new settings that are applied to the policies.
Prerequisites
Verify that you are logged in to a vSphere Client as an administrator, and vCenter Operations Manager is open.
Procedure
1 Click the Configuration link on the main vCenter Operations Manager page.
2 Create a new policy or open an existing policy for editing.
Option Description
To create a new policy
In the Manage Policies pane, click the Create Policy icon .
To modify an existing policy
In the Manage Policies pane, select the policy that you want to associate to
groups and click the Edit Policy icon .
3 Click 4c Underused and stressed and change the settings for underused and stressed rules.
Option Description
Underused Cluster and Host
Detection Rules
You modify these settings to define when a Cluster or ESX host is considered
idle.
Underused threshold
Sets the amount of nonusage in the entire environment defined by the
Underused threshold percentage, calculated for the time interval over which
the nonusage is analyzed.
You define the time range in the Manage Display Settings section of the
Configuration dialog box.
Detection based on any of the
thresholds
Triggers the oversized status if any detection benchmark is met.
Detection based on all of the
thresholds
Triggers the oversized status if all detection benchmarks are met.
CPU demand less than threshold
Considers the host or cluster underused when the following conditions are
met:
n
CPU use is less than the percentage of its allocated capacity as indicated
in this field.
n
Duration of CPU activity under the threshold compared to total time
evaluated meets the percentage Underused threshold.
VMware vCenter Operations Manager Getting Started Guide
98 VMware, Inc.