text: The Storwize V7000 supports extent sizes from 16 mebibytes (MiB) to 8192 MiB. The extent 
  size is a property of the storage pool and is set when the storage pool is created. 
  
  The extent size of a storage pool cannot be changed. If you need to change extent size, the 
  storage pool must be deleted and a new storage pool configured. 
  
  Table 3-2 lists all of the available extent sizes in a Storwize V7000 and the maximum 
  managed storage capacity for each extent size. 