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# View the compression ratio of a storage group

Data compression efficiency is a measurement of the relative reduction in size of data representation that is produced by a data compression algorithm. It is typically expressed as the division of uncompressed size by compressed size.

## Prerequisites

Users must have at least Monitor rights to view the data reduction ratio. See Roles and associated permissions to determine the user roles that can perform this task.

## Steps

1. Select a storage system.
2. Select Storage > Storage Groups .
3. Select a storage group and click .
   The Data Reduction, Data Reduction Ratio, and VP Saved fields for the selected storage group are displayed.

   If data reduction is enabled on the storage group, a tick appears in the Data Reduction field. If data reduction is disabled, a horizontal dash is shown.