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 3a Capacity and time remaining and modify the settings.
Option Description
Spikes and Peaks
Determines whether to take the more conservative approach of using
stress in accounting for spikes and peaks in capacity use.
Select the check box if you want a more conservative approach to account
for demand used in capacity and time remaining calculations using the
settings for stress calculation in sections 4b and 4c of the policy
configuration dialog box. Deselect the check box if you want the demand
to be the average demand without accounting for spikes and peaks.
Capacity Remaining is based on:
Choose the model for capacity calculations:
n
Physical or Configured Capacity. Uses physical capacity in metric
calculations. vCenter Operations Manager does not calculate VMware
HA and buffer percentages.
n
Usable Capacity. Activates support for VMware HA and buffer
percentages in metric calculations. You can further specify HA and
buffer settings in the Usable Capacity global settings.
Time Remaining is based on:
Contains settings that affect the calculations of Time Remaining badge
scores and alerts.
n
From the drop-down menu, select the algorithm to be used for
calculating the Time Remaining badge score.
n
Select Planning Cyclical to use planning data and algorithm.
vCenter Operations Manager considers historical data based on
the business cycle and data calculation that you define such as
specifying usable capacity, stress, and business hours.
n
Select Real Time to use real time data and algorithm.
vCenter Operations Manager considers real data and does not
consider any other configuration details.
n
In the Days of provisioning buffer text box, type the number of days
to be used as score provisioning buffer when calculating the score of
the Time Remaining badge. vCenter Operations Manager applies the
following formula to calculate the badge score.
Time Remaining badge score = Log10(Time Remaining -
Provisioning Buffer
Threshold + 1) / Log10(Time Remaining Window -
Provisioning Buffer Threshold + 1) * 100
Demand or Allocation by Compute
Resource
For each compute resource (VM, Datastore, or Containers), select whether
to use Demand or Allocation (or both) in calculations for CPU, Memory,
Disk I/O, Disk Space, and Network I/0. Containers are the World,
vCenters, data centers, clusters and hosts, but not groups.
A Demand model uses requested resources to calculate remaining
resources. A Demand model considers the actual usage of a resource. An
Allocation model considers allocated resources to be used and unallocated
resources as capacity remaining. An Allocation model is used in
calculations for CPU, memory, and disk space. A Demand model is more
aggressive, while an Allocation model is more conservative. When you
select the check box for disk space (container), it is the sum of all the
allocated resources like virtual machine disk and so on.
Reservations for CPU and Memory are always included in Capacity and
Time remaining calculations.
Chapter 8 Set How Data Appears in vCenter Operations Manager
VMware, Inc. 97