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Changes to Fault Tolerance in vSphere 4.1

This article describes the changes to Fault Tolerance (FT) in vSphere 4.1.

In vSphere 4.1:

FT is integrated with DRS, which means that DRS can now load balance both the primary and secondary Fault Tolerant virtual machines.

Note: This feature does require EVC.
FT has a version associated with it, which means that the primary and secondary ESX do not need to be run at the same build number/patch level.
Primary and secondary events are labelled as primary and secondary, which provides better differentiation
FT has improved host management. For example:
- Moving ESX hosts from one vCenter Server instance to another no longer causes FT failures
- DRS can now vMotion FT protected virtual machines.
- Administrators are now warned that FT is disabled when disabling HA.

FT with vSphere 4.1 cannot function with these configurations:

For more information on using Fault Tolerance, see the vSphere Availability Guide.

To request a new product feature or to provide feedback on a VMware product, please visit the Request a Product Feature page.

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