5.8.5

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 3b Usable Capacity and change the settings for usable capacity.
Option Description
Use High Availability (HA)
Configuration, and reduce capacity
If HA is configured on the clusters in your virtual environment, selecting
this option excludes the CPU and memory reserved per the HA settings
when calculating capacity scores in vCenter Operations Manager.
% of resource capacity to reserve
as buffer:
Sets the percent of reserve capacity for CPU, memory, disk I/O, disk space,
or Network I/O.
Capacity Calculation Rules
Select how to calculate capacity.
n
Use last known capacity. Bases capacity calculations on the last
known capacity for the selected data interval. This setting affects the
remaining capacity. Although you expect a proportional relationship
between utilization and capacity, the average utilization might exceed
the last known capacity when the capacity drops.
n
Use actual capacity. Bases capacity calculations on the average known
capacity for the selected data interval.
If you choose Use last known capacity and your capacity has dropped over time, it is likely that your
average usage will be larger than your last known capacity. This situation can generate an alert due to
negative capacity remaining.
4 Click OK or Finish to save your settings, or select another option to configure.
5 Click Done to close the Configuration dialog box.
The usable capacity settings are reconfigured.
Example: Examples of Usable Capacity Global Settings
These examples show how some of the settings are used.
Use last known capacity
If the interval included in the view is two months, and today is June 30,
views of capacity such as Average Virtual Machine Capacity show you the
capacity used on June 30.
Use actual capacity
If the interval included in the view is two months, and today is June 30,
views of capacity show you the average of capacity used in May and June.
Modify Usage Calculation Settings
Specify the number of hours during the work week over which average capacity usage is calculated, and
identify peak hours or spikes by excluding data that falls into a regular pattern. If the allocation model is
enabled, set the target ratios for CPU, Memory, and Disk Space.
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.
Chapter 8 Set How Data Appears in vCenter Operations Manager
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