6.0.1

n
Linked clones. You cannot use Fault Tolerance on a virtual machine that is a linked clone, nor can you
create a linked clone from an FT-enabled virtual machine.
n
VM Component Protection (VMCP). If your cluster has VMCP enabled, overrides are created for fault
tolerant virtual machines that turn this feature off.
n
Virtual Volume datastores.
n
Storage-based policy management.
n
I/O filters.
Features and Devices Incompatible with Fault Tolerance
Not all third party devices, features, or products can interoperate with Fault Tolerance.
For a virtual machine to be compatible with Fault Tolerance, the Virtual Machine must not use the following
features or devices.
Table 3‑1. Features and Devices Incompatible with Fault Tolerance and Corrective Actions
Incompatible Feature or Device Corrective Action
Physical Raw Disk mapping (RDM). With legacy FT you can reconfigure virtual machines with
physical RDM-backed virtual devices to use virtual RDMs
instead.
CD-ROM or floppy virtual devices backed by a physical or
remote device.
Remove the CD-ROM or floppy virtual device or
reconfigure the backing with an ISO installed on shared
storage.
USB and sound devices. Remove these devices from the virtual machine.
N_Port ID Virtualization (NPIV). Disable the NPIV configuration of the virtual machine.
NIC passthrough. This feature is not supported by Fault Tolerance so it must
be turned off.
Hot-plugging devices. The hot plug feature is automatically disabled for fault
tolerant virtual machines. To hot plug devices (either
adding or removing), you must momentarily turn off Fault
Tolerance, perform the hot plug, and then turn on Fault
Tolerance.
NOTE When using Fault Tolerance, changing the settings
of a virtual network card while a virtual machine is
running is a hot-plug operation, since it requires
"unplugging" the network card and then "plugging" it in
again. For example, with a virtual network card for a
running virtual machine, if you change the network that
the virtual NIC is connected to, FT must be turned off first.
Serial or parallel ports Remove these devices from the virtual machine.
Video devices that have 3D enabled. Fault Tolerance does not support video devices that have
3D enabled.
Virtual EFI firmware Ensure that the virtual machine is configured to use BIOS
firmware before installing the guest operating system.
Virtual Machine Communication Interface (VMCI) Not supported by Fault Tolerance.
2TB+ VMDK Fault Tolerance is not supported with a 2TB+ VMDK.
vSphere Availability
48 VMware, Inc.