text: Figure 6-19 Listing parent and child pools 
  
  Creation of a child pool within a child pool is not possible. 
  
  In the CLI, the same**mkmdiskgrp**command that was used for parent pools is used to create 
  child pools. You need to specify the parent pool for your new child pool and its size, as shown 
  in Example 6-9. Size is given in MB and should be equal to parent’s pool extent size multiplied 
  by an integer. In this case, it is 100*1024MB = 100 GB. 
  
  Example 6-9 mkmdiskgrp for child pools 
  
  IBM_Storwize:ITSOV7K:superuser>mkmdiskgrp -parentmdiskgrp Pool0 -size 102400 -name 
  Pool0_child0 