You can view fault tolerant virtual machines in the vCenter Server inventory using the vSphere Client.

Note

You cannot disable Fault Tolerance from the Secondary VM.

A vSphere Fault Tolerance section (pane) appears in the Summary tab for the Primary VM and includes information about the virtual machine.

Fault Tolerance Status

Indicates the Fault Tolerance status of the virtual machine.

Protected. The Primary and Secondary VMs are powered on and running as expected.

Not Protected. The Secondary VM is not running. Possible reasons are listed in the table.

Reasons for Primary VM Not Protected Status

Reason for Not Protected Status

Description

Starting

Fault Tolerance is in the process of starting the Secondary VM. This message is only visible for a short period of time.

Need Secondary VM

The Primary VM is running without a Secondary VM, so the Primary VM is currently not protected. This occurs when no compatible host in the cluster is available for the Secondary VM. Correct this by bringing a compatible host online. If a compatible host is online in the cluster, you might need to investigate further. Under certain circumstances, disabling Fault Tolerance and then re-enabling it corrects this problem.

Disabled

Fault Tolerance is currently disabled (no Secondary VM is running). This happens when Fault Tolerance is disabled by the user or when vCenter Server disables Fault Tolerance after being unable to power on the Secondary VM.

VM not Running

Fault Tolerance is enabled but the virtual machine is powered off. Power on the virtual machine to reach Protected state.

Secondary location

Displays the ESXi host on which the Secondary VM is hosted.

Total Secondary CPU

The CPU usage of the Secondary VM, displayed in MHz.

Total Secondary Memory

The memory usage of the Secondary VM, displayed in MB.

vLockstep Interval

The time interval (displayed in seconds) needed for the Secondary VM to match the current execution state of the Primary VM. Typically, this interval is less than one-half of one second. No state is lost during a failover, regardless of the vLockstep Interval value.

Log Bandwidth

The amount of network capacity being used for sending vSphere Fault Tolerance log information from the host running the Primary VM to the host running the Secondary VM.

For each host configured to support Fault Tolerance, you can view information about its fault tolerant virtual machines by accessing the host's Summary tab in the vSphere Client. The Fault Tolerance section of this screen displays the total number of Primary and Secondary VMs residing on the host and the number of those virtual machines that are powered on. If the host is ESX/ESXi 4.1 or greater, this section also displays the Fault Tolerance version the host is running. Otherwise, it lists the host build number. For two hosts to be compatible they must have matching FT version numbers or matching host build numbers.