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## 7.2.3 Capacity savings option 

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. 

<img src='content_image/972559.jpg'>

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. 

## 7.3 Creating custom volumes 

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: 

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 

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 

