# Enum - HostFeatureVersionKey(vim.host.FeatureVersionInfo.FeatureVersionKey)

Since
  vSphere API 4.1

## Enum Description

Set of possible values for key, which is a unique key that identifies a feature.

Enum Constants

Name | Description
--- | ---
faultTolerance | VMware Fault Tolerance feature. For pre-4.1 hosts, the version value reported will be empty in which case build should be used. For all other hosts, the version number reported will be a component-specific version identifier of the form X.Y.Z, where: X refers to host agent Fault Tolerance version number, Y refers to VMX Fault Tolerance version number, Z refers to VMkernal Fault Tolerance version

Show WSDL type definition
<simpleType xmlns="http://www.w3.org/2001/XMLSchema" xmlns:vsan="urn:vsan" name="HostFeatureVersionKey"> <restriction base="xsd:string"> <enumeration value="faultTolerance"/> </restriction> </simpleType>