Yes  I would suggest to start with the Unity White papers to get familiar with the Unity archtitecture.  In terms of sizing for NDMP the approach I recommend is to size to actual usage vs. theoretical bandwidth. I.e. measure how much NDMP peformance is used with the current VNX/Celerra systems - then work with your local Speed Guru on sizing for Unity.  Rainer
Hello We need to replace several VNX5600 NASs each equipped with 4 x DB XBlades (3 + 1) and backed up to NDMP on DataDomain and tapes As UNITY does not know how to make 2-way NDMP at the moment, what are the recommendations for optimizing backup flows in NDMP? On our VNX5600, we have 3 active DMs each managing 8 backup streams, ie a total of 24 NDMP flows on FC @ 8 Gb / s, or a total thermal of 192 Gb / s. How to replace the VNX5600 NAS by UNITY that can have the same NDMP backup performance? Knowing that on the U300 / 400 it is possible to manage only 8 Fluxes in 3-way via the LAN 10 Gb and that it is impossible to put 8 ports 10Gb on each UNITY. In addition, the U500 / 600 models can handle 20 NDMP streams, but what number of 10 Gb network links can parallel us for maximum performance? Thanks for your feedback B.Rgds
UNITY NAS NDMP BACKUP  PERFORMANCE