text: This command expands the volume_C volume (which was 35 GB) by another 5 GB to give it 
  a total size of 40 GB. 
  
  To expand a thin-provisioned volume, you can use the**-rsize**option, as shown in 
  Example 7-20 on page 304. This command changes the real size of the volume_B volume to a 
  real capacity of 55 GB. The capacity of the volume is unchanged. 