6.0

The results of the compliance test appear at the bottom of the screen. A host is labeled as either Compliant
or Noncompliant.
Using Fault Tolerance
After you have taken all of the required steps for enabling vSphere Fault Tolerance for your cluster, you can
use the feature by turning it on for individual virtual machines.
Before Fault Tolerance can be turned on, validation checks are performed on a virtual machine.
After these checks are passed and you turn on vSphere Fault Tolerance for a virtual machine, new options
are added to the Fault Tolerance section of its context menu. These include turning off or disabling Fault
Tolerance, migrating the Secondary VM, testing failover, and testing restart of the Secondary VM.
Turn On Fault Tolerance for Virtual Machines in the vSphere Client
You can turn on vSphere Fault Tolerance through the vSphere Client.
When Fault Tolerance is turned on, vCenter Server unsets the virtual machine's memory limit and sets the
memory reservation to the memory size of the virtual machine. While Fault Tolerance remains turned on,
you cannot change the memory reservation, size, limit, or shares. When Fault Tolerance is turned off, any
parameters that were changed are not reverted to their original values.
Prerequisites
Open a vSphere Client connection to a to vCenter Server using an account with cluster administrator
permissions.
Procedure
1 Select the Hosts & Clusters view.
2 Right-click a single virtual machine and select Fault Tolerance > Turn On Fault Tolerance.
If you select more than one virtual machine, the Fault Tolerance menu is disabled. You must turn Fault
Tolerance on for one virtual machine at a time.
The specified virtual machine is designated as a Primary VM and a Secondary VM is established on another
host. The Primary VM is now fault tolerant.
Setting Options for Fault Tolerant Virtual Machines in the vSphere Client
After you turn on vSphere Fault Tolerance for a virtual machine, new options are added to the Fault
Tolerance section of its context menu.
In the vSphere Client, there are options for turning off or disabling Fault Tolerance, migrating the secondary
virtual machine, testing failover, and testing restart of the secondary virtual machine.
Turn Off Fault Tolerance in the vSphere Client
Turning off vSphere Fault Tolerance deletes the secondary virtual machine, its configuration, and all history.
Use this option if you do not plan to reenable the feature. Otherwise, use the Disable Fault Tolerance
option.
Prerequisites
Launch the vSphere Client and log in to a vCenter Server system.
If the Secondary VM resides on a host that is in maintenance mode, disconnected, or not responding, you
cannot use the Turn Off Fault Tolerance option. In this case, you should disable and enable Fault Tolerance
instead.
vSphere Administration with the vSphere Client
396 VMware, Inc.