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Each PowerEdge R750 server in the SS pair is equipped with four quad-port 12 Gb/s SAS host bus adapters HBA355e and two NVIDIA Mellanox InfiniBand HDR adapters to handle storage requests. This allows the SAS HBAs to be evenly distributed across the two CPUs for load balancing. With four quad-port 12 Gb/s SAS controllers in each PowerEdge R750, the two servers are redundantly connected to each of the four PowerVault ME5084 high-density storage arrays, with a choice of 8 TB, 12 TB, 16 TB, or 20TB of NL SAS 7.2 K RPM hard disk drives (HDDs) or any supported drive as defined in the Dell PowerVault ME5 Series Storage System Support Matrix. Figure 5 shows the SAS ports on the ME5084 array.