7.2.3 Capacity savings option 7.3 Creating custom volumes When you use the Basic or Mirrored method of volume creation, the GUI provides a  Capacity  Savings option. With this option, you can alter the volume provisioning parameters without  using the Custom volume provisioning method. You can select  Thin-provisioned  or  Compressed  from the drop-down menu as shown in Figure 7-16 to create thin-provisioned or  compressed volumes. Note:  Before you create the first compressed volume copy on a system, consider the  compression guidelines in Chapter 10, “Advanced features for storage efficiency” on  page 427. When a thin-provisioned or compressed volume is defined in a data reduction pool, the  Deduplicated  check box becomes available. Select it to enable deduplication of the volume. The Create Volumes window also enables Custom volume creation, which expands the set of  options for volume creation that are available to the administrator. The  Custom  menu consists of several panes: Work through these panes to customize your  Custom  volume as wanted, and then commit  these changes by clicking  Create . You can mix and match settings on different panes to  achieve the final volume configuration that matches your requirements Chapter 7. Volumes  287 GLYPH<SM590000> Volume Location  – Mandatory, defines the number of volume copies, Pools to be used,  and I/O group preferences. GLYPH<SM590000> Volume Details  – Mandatory, defines the  Capacity savings  option. GLYPH<SM590000> Thin Provisioning  – Enables configuration of Thin Provisioning settings, when you have  selected this capacity saving option. GLYPH<SM590000> Compressed  – Enables configuration of Compression settings, when you have selected  this capacity saving option. GLYPH<SM590000> General  – For configuration of Cache mode and Formatting. GLYPH<SM590000> Summary Figure 7-16 Volume Creation with Capacity Saving option 