func cephRBDVolumeCreate(clusterName string, poolName string, volumeName string,
	volumeType string, size string, userName string) error {
	_, err := shared.RunCommand(
		"rbd",
		"--id", userName,
		"--image-feature", "layering,",
		"--cluster", clusterName,
		"--pool", poolName,
		"--size", size,
		"create",
		fmt.Sprintf("%s_%s", volumeType, volumeName))
	return err
}
func cephRBDVolumeCreate(clusterName string, poolName string, volumeName string,
	volumeType string, size string, userName string) error {
	_, err := shared.RunCommand(
		"rbd",
		"--id", userName,
		"--image-feature", "layering,",
		"--cluster", clusterName,
		"--pool", poolName,
		"--size", size,
		"create",
		fmt.Sprintf("%s_%s", volumeType, volumeName))
	return err
}
// cephRBDVolumeCreate creates an RBD storage volume.
// Note that the set of features is intentionally limited is intentionally
// limited by passing --image-feature explicitly. This is done to ensure that
// the chances of a conflict between the features supported by the userspace
// library and the kernel module are minimized. Otherwise random panics might
// occur.