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# View compressibility reports

Storage groups are a collection of devices that are stored on the storage system, and an application, a server, or a collection of servers use them.

## About this task

This procedure shows how to view maximum data compressibility of storage groups on an All Flash storage system. Data reduction must be enabled on the storage system.

Before you begin:

- This feature is only allowed on All Flash systems running the HYPERMAX OS 5977 Q3 2016 Service Release or PowerMaxOS 5978, or higher.
- The account that you use on Unisphere must have Monitor privilege at least. See Roles and associated permissions to determine the user roles that can perform this task.

## Steps

1. Select the storage system.
2. Select CAPACITY to open the CAPACITY dashboard.
3. Select a SRP instance from the drop-down menu and in the Actions panel, click COMPRESSIBILITY.

   The report lists the following details for each storage group:

   - Storage Group—The name of the storage group
   - # of Volumes—The number of volumes in the group
   - Allocated (GB)—The amount of space that is allocated to the storage group
   - Used (GB)—The amount of allocated space that the group is using
   - Target Ratio—The expected data reduction ratio based on the last 24 hours of samples; if all storage groups are compressed, the compressibility report is empty except for an entry named NOT_IN_SG (assuming that not all of the configured volumes are in storage groups).