text: Figure 6-4 Create Pool dialog box 
  
  Mark the**Data Reduction**check box to create the Data Reduction Pool. Leaving it unmarked 
  creates a standard storage pool. 
  
  A standard storage pool that is created by using the GUI has a default extent size of 1 GB. 
  Data Reduction Pools have a default extent size of 4 GB. The size of the extent is selected at 
  creation time and cannot be changed later. 
  
  If you want to specify a different extent size, you can enable this option by clicking**Settings**→ 
  **GUI Preferences**→**General**and checking**Advanced pool settings**, as shown in 
  Figure 6-5. 