Enabling FT on a virtual machine fails - Error: "No suitable host can be found to place the Fault Tolerance Secondary VM for virtual machine"

Products

• VMware vSphere ESXi

Issue/Introduction

• Cannot enable Fault Tolerance (FT) on a virtual machine
• Enabling FT on a virtual machine fails
• You see the error:
  
  No suitable host can be found to place the Fault Tolerance Secondary VM for virtual machine vm_name

Environment

• VMware ESXi 4.0.x Embedded
• VMware ESXi 4.0.x Installable
• VMware ESXi 4.1.x Embedded
• VMware ESX 4.0.x
• VMware ESXi 4.1.x Installable
• VMware ESX 4.1.x

Cause

This issue occurs when there are no compatible hosts in the cluster which can run the Fault Tolerance secondary virtual machine.

Resolution

Reconfigure the existing hosts by installing compatible ESX versions or reconfigure the primary virtual machine to ensure compatibility.

Additional Information

• VMware Fault Tolerance FAQ (1013428)