// +optional
  optional string fsType = 2;

  // partition is the partition in the volume that you want to mount.
  // If omitted, the default is to mount by volume name.
  // Examples: For volume /dev/sda1, you specify the partition as "1".
  // Similarly, the volume partition for /dev/sda is "0" (or you can leave the property empty).
  // +optional
  optional int32 partition = 3;