Note:  If your DRP has a total capacity below 50 TB, you might need to decrease the extent  size from the default for DRP (which is 4 GB) to 1 GB for optimal space savings. The main purpose of DRPs is to be a fast and efficient container for volumes with data  reduction capability. DRPs can also contain fully allocated volumes. To create a volume on a DRP, browse to  Volumes  Volumes  and click  Create Volumes . Figure 9-12 shows the Create Volumes window. Under the Capacity Savings menu, you can  select None, Thin Provisioned and Compressed. If Compressed or Thin Provisioned are  selected, the Deduplicated option also becomes available and can be selected. Figure 9-13 on page 456 shows the Volumes window with a list of volumes, which are created  in the DRP pool. Only Capacity (which is virtual capacity, available to a host) is shown. Real  capacity, Used capacity, and Compression savings show Not Applicable for volumes with  capacity savings. Only fully allocated volumes display those parameters.  Note:  When using and reviewing Volumes in DRPs, be aware that there is no volume-copy  level reporting on used capacity.  Capacity monitoring Figure 9-12 Create compressed volume Chapter 9. Advanced features for storage efficiency  455