Re: Ask the Expert: All About FLASH.NEXT
RRR - inline deduplication in XtremIO is "truly" inline and always ON. What this means is that this feature (along with other features like thin provisioning) are always ON and you do not have an option to turn it OFF. In fact, the more deduplication the array does, the more performance benefit you see from an application point of view.
This happens because deduplication has been baked in the software design of the array and is not a "add-on" feature that would potentially impact the array's performance.