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# View the compression ratio details of a volume

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 compression 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. Click and click the number next to Volumes.
4. Select a volume and click .
   The Data Reduction Ratio field for the selected volume is displayed. If the data reduction ratio is not applicable on the volume, "N/A" is displayed.
5. Alternatively, select a storage system and then select Storage > Volumes .
6. Select a volume and click .
   The Data Reduction Ratio field for the selected volume is displayed.