// AzureFile represents an Azure File Service mount on the host and bind mount to the pod.
	// +optional
	AzureFile *AzureFilePersistentVolumeSource
	// VsphereVolume represents a vSphere volume attached and mounted on kubelet's host machine
	// +optional
	VsphereVolume *VsphereVirtualDiskVolumeSource
	// AzureDisk represents an Azure Data Disk mount on the host and bind mount to the pod.
	// +optional
	AzureDisk *AzureDiskVolumeSource

const (
	// used for PersistentVolumes that are not available
	VolumePending PersistentVolumePhase = "Pending"
	// used for PersistentVolumes that are not yet bound
	// Available volumes are held by the binder and matched to PersistentVolumeClaims
	VolumeAvailable PersistentVolumePhase = "Available"
	// used for PersistentVolumes that are bound
	VolumeBound PersistentVolumePhase = "Bound"