Did i can trust to 1/10 compression for planning capacity for ArcSight ESM?

Hi All

I am planning the capacity of Storage allocation to ArcSight ESM. in this case i have a limitation for EPS and LogVolume/Day in ESM license. 

as you know there are a huge feature in smart connector imply to 1/10 compression.

did i can trust to the compression feature for capacity planning and storage design?