6.4

Table 2‑1. Project Scenarios for Selected Objects (Continued)
Selected Object Project Scenarios
Datastore Capacity
n
Add or remove percentage of capacity.
n
Change absolute capacity.
Demand
n
Add or remove virtual machine or percentage of demand.
n
Change absolute demand.
Virtual Machine
n
Add, change, or remove capacity.
n
Add, change, or remove demand.
This chapter includes the following topics:
n
“Right-Sizing Capacity for Stress-Free Demand and Value,” on page 80
n
“User Scenario: Planning Capacity for an Increase in Workload,” on page 84
n
“Planning Hardware Projects in vRealize Operations Manager,” on page 87
n
“Planning Virtual Machine Projects and Scenarios,” on page 88
n
“Custom Proles in VMware vRealize Operations Manager,” on page 91
n
“Custom Datacenters in VMware vRealize Operations Manager,” on page 91
Right-Sizing Capacity for Stress-Free Demand and Value
Performance management and capacity planning vary across organizations and environments. Because the
demand for capacity uctuates in each environment, the top contenders for priority often include high
eciency versus low risk of poor performance. To plan and manage your capacity needs and intelligently
calculate the capacity of your resources, vRealize Operations Manager uses sophisticated models.
With the capacity calculations in vRealize Operations Manager, you can use various sophisticated models to
produce practical correlations between objective measured metrics and subjective goals of acceptable
performance and eciency.
In vRealize Operations Manager, stress involves how high and how long the demand persists relative to the
capacity available, and vRealize Operations Manager uses this value to measure the potential for
performance problems. The higher the stress score, the worse the potential is for degraded performance on
your objects. Depending on the conguration of the policy analysis seings for stress, a score of green might
indicate 0–24 percent of stress. A score of red might indicate more than 50 percent of stress. With the ve-
minute data collections and the intelligent stress calculations, vRealize Operations Manager can easily
identify periods of poor performance.
Demand drives stress. vRealize Operations Manager bases the calculations for right-sizing capacity on past
demand. The goal of right-sizing is to produce a green level of stress, marked by a green Stress badge.
Usable capacity is equal to the total capacity available minus any buers that administrators or users
dened. To measure the right-sized amounts of usable capacity, the capacity calculations use what is called a
stress-free value. Using the demand, stress, and the stress-free value, vRealize Operations Manager
calculates the right size.
The capacity analytics determine the actual and eective demand for resources based on having no
contention. The calculations consider the capacity to be unlimited and free of contention for resources,
which results in no stress on the available capacity. The result is called the stress-free demand or the stress-
free value.
vRealize Operations Manager User Guide
80 VMware, Inc.