HostSystemPowerState_enum
Defines a host's power state.
Possible values:
poweredOn: The host is powered on.A host that is entering standby mode entering is also in this state.
poweredOff: The host was specifically powered off by the user through VirtualCenter.This state is not a cetain state, because after VirtualCenter issues the command to power off the host, the host might crash, or kill all the processes but fail to power off.
standBy: The host was specifically put in standby mode, either explicitly by the user, or automatically by DPM.This state is not a cetain state, because after VirtualCenter issues the command to put the host in standby state, the host might crash, or kill all the processes but fail to power off. A host that is exiting standby mode exiting is also in this state.
unknown: If the host is disconnected, or notResponding, we cannot possibly have knowledge of its power state.Hence, the host is marked as unknown.