5.8.5

4 On the Change Type page, select Virtual machines and click Next.
5 Select Add virtual machines using profiles of existing virtual machines as models and click Next.
6 Select existing virtual machines from the list to use as profiles for the new virtual machines.
The list of the existing virtual machines applies to the datacenter of the selected object. The Datacenter
and the Cluster or Host drop-down menus narrow the scope of the virtual machine list. The list
provides CPU, memory, and disk information such as the used space and the use of thin disks or linked
clones.
7 Click Next.
8 To duplicate any virtual machines, increase the virtual machine count and click Next.
9 On the Ready to Complete page, check the parameters of your what-if scenario and click Finish to view
the outcomes.
vCenter Operations Manager applies the scenario to the view you selected and shows current capacity
compared to the expected capacity if you add the virtual machines to the target object.
What to do next
If you have more than one scenario for a view, you can combine and compare the outcomes. To save the
information, export the scenario results.
Create a Hardware Change Scenario
Before you purchase new hardware, you can create hardware change scenarios to determine if the purchase
is necessary. To determine the effect of adding, removing, or updating the hardware capacity in a cluster,
create a scenario that models changes to hosts and datastores.
Prerequisites
In vCenter Operations Manager, verify that the Summary tab under the Planning tab is open.
Procedure
1 Select the target host in the inventory panel.
The target host is where you simulate changes to the environment to examine possible outcomes.
2 Click the New what-if scenario link.
3 Select a view for the scenario and click Next.
This step is not available if you opened the What-if Scenario wizard from the Views tab.
4 On the Change Type page, select Hosts & Datastores and click Next.
5 Use the buttons to add, remove, or restore hosts in the host list.
Actions are applied only to hosts that you selected using the check boxes in the hosts list.
6 Click host rows to change the physical resources and click Save.
You can use the text boxes and drop-down menus to modify the CPU capacity and the memory size of
the selected host.
Option Description
CPU Total
Number of CPU cores that a target single host will have, followed by the
target processor core speed.
Memory Total
Amount of memory that the target host profile will have.
7 Click Next.
Chapter 5 Assessing Risk and Efficiency in vCenter Operations Manager
VMware, Inc. 61