To maintain a high level of performance and stability for your fault tolerant virtual machines and also to minimize failover rates, you should be aware of certain troubleshooting issues.
The troubleshooting topics discussed focus on problems that you might encounter when using the vSphere Fault Tolerance feature on your virtual machines. The topics also describe how to resolve problems.
You can also see the VMware knowledge base article at http://kb.vmware.com/kb/1033634 to help you troubleshoot Fault Tolerance. This article contains a list of error messages that you might encounter when you attempt to use the feature and, where applicable, advice on how to resolve each error.