Virtual Machine Upgrade VM Task
Upgrades this virtual machine's virtual hardware to the latest revision that is supported by the virtual machine's current host.
Required privileges: VirtualMachine.Config.UpgradeVirtualHardware
The unique identifier for the managed object to which the method attaches; the serialized managed object reference for a request has the form moType/moId, in this case VirtualMachine/{moId}.
The vSphere release schema. The current specification covers vSphere 8.0.2.0 APIs.
{
    "version": "string"
}If specified, upgrade to that specified version. If not specified, upgrade to the most current virtual hardware supported on the host.
This method returns a Task object with which to monitor the operation.
{
    "_typeName": "string",
    "type": "string",
    "value": "string"
}InvalidPowerState: if the power state is not poweredOff.
TaskInProgress: if the virtual machine is busy.
AlreadyUpgraded: if the virtual machine's hardware is already up-to-date.
NoDiskFound: if no virtual disks are attached to this virtual machine.
InvalidState: if the host is in maintenance mode, if an invalid version string is specified, or if the virtual machine is in a state in which the operation cannot be performed. For example, if the configuration information is not available.
{
    "_typeName": "string",
    "faultCause": "MethodFault Object",
    "faultMessage": [
        {
            "_typeName": "string",
            "key": "string",
            "arg": [
                {
                    "_typeName": "string",
                    "key": "string",
                    "value": {
                        "_typeName": "string"
                    }
                }
            ],
            "message": "string"
        }
    ]
}