5.7

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.
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.
n
Select Real Time to use real time data and algorithm.
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 Managerapplies 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.
An Allocation model considers allocated resources to be used and
unallocated resources as capacity remaining. Demand is more aggressive,
while Allocation is more conservative.
Reservations for CPU and Memory are always included in Capacity and
Time remaining calculations.
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 capacity and time remaining settings are reconfigured.
Example: Examples of Capacity and Time Remaining Settings
These examples show how some of the settings are used.
Compute Resources to
Analyze
If you have a mixed host environment or your ESX or vSphere version limits
the ability to view disk I/O metrics, you can turn off that resource type.
Usable Capacity
If you stress the load on your systems and want extra headroom for error,
activate buffer support with this setting.
What to do next
If you selected Usable Capacity, configure the high availability and buffer settings in section 3b Usable
capacity of the policy configuration dialog box.
Chapter 8 Set How Data Appears in vCenter Operations Manager
VMware, Inc. 95