text: Figure 7-4 Image mode volume versus striped volume 
  
  An image mode volume is mapped to one, and only one, image mode MDisks and is mapped 
  to the entirety of the MDisk. Therefore, the image mode volume capacity must be equal to the 
  size of the corresponding image mode MDisk. If the size of the (image mode) MDisk is not a 
  multiple of the MDisk group’s extent size, the last extent is marked as partial (not filled). 
  
  When you create an image mode volume, the specified MDisk must be in unmanaged mode 
  and must not be a member of a storage pool. As the image mode volume is configured, the 
  MDisk is made a member of the specified storage pool (Storage Pool_IMG_*xxx*). 
  
  IBM Spectrum Virtualize also supports the reverse process, in which a managed mode 
  volume can be migrated to an image mode volume. The extent size that is chosen for this 
  specific storage pool must be the same as the extent size of the storage pool into which you 
  plan to migrate the data off the image mode volumes. If a volume is migrated to another 
  MDisk, it is represented as being in managed mode during the migration. Its mode changes to 
  “image” only after the process completes. 