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# Viewing the compression efficiency dashboard

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

## Prerequisites

See Roles and associated permissions to determine the user roles than can perform this task.

## About this task

This procedure explains how to view the compression efficiency of a storage system running HYPERMAX OS 5977 or PowerMaxOS 5978.

## Steps

1. Select a storage system.
2. Select PERFORMANCE > Dashboards.
3. Choose System as the category.
4. Click on the Efficiency tab.