Hello 5X5CX62,

The compression ratio is dependent on the data that is on your SCv3000.  The ratio can be different based on the file types that you are using.  Here is some additional information about compression on page 15 of this guide. https://downloads.dell.com/manuals/common/sc-series-performance-availability-best-practices-dell-emc-4024-bp-sc_en-us.pdf

Please let us know if you have any other questions.