Good post by Chris Mellor (thank you)
EMC introduced its scale-out ScaleIO Node virtual SAN a couple of weeks ago, with hybrid flash-disk and all-flash server chassises. It overlaps as a product with EMC-owned VMware’s VSAN, and therefore EMC’s EVO:RAIL implementation of that, and also competes with scale-out all-flash arrays.
Discussions with sources have clarified EMC’s thinking on the topic, and showed that the overlap is less than originally thought.
Read on here