This document discusses Dell EMC ScaleIO software-defined block storage. It provides an overview of ScaleIO and its benefits, including massive scalability from 3 to over 1,000 nodes, extreme performance with tens of millions of IOPS, unparalleled flexibility to deploy on any hardware and choice of configurations, supreme elasticity to scale on the fly without downtime, and compelling economics with lower TCO. Case studies show how ScaleIO has helped customers drastically reduce costs, improve performance, and scale their storage infrastructure elastically.