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UnitVSA features Host I/O limits, also known as Quality of service. The EMC [Physical] Unity array comes with a pack of new hardware and software features focusing on the true unification: * Support for setting up Host I/O limits, also known as QOS, providing a more predictable performance for the workloads by putting limits on I/O throughputs and bandwidth * DPE reduced from a 7U footprint to an innovative 2U footprint * 12 GB SAS back-end for the Unity DAEs; EMC VNX/VNXe supported only 6 GB SAS backend * Completely redesigned user interface based on HTML5 References: http://www.presidio.com/blog/technical-summary-emc-unification-unity