I have the following configuration:
Dell PowerEdge R720 with 2 x Dual Port SAS HBA
Dell PowerVault MD3220 with 24 x 900GB SAS disks
OS = Windows 2012 Server Enterprise with 256GB RAM. (No Hyper-V)
I have connected the MD up using 2 ports going to Controller 0 and 2 ports to Controller 1. I have a single LUN configured. I have enabled MPIO and confirmed that the status indicates I have two channels as active, and two channels as passive. This is expected as the LUN is owned by Controller 0. The unexpected part is that I cannot seem to get more than 600MB/s throughput. I should be able to get 1200MB/s in this configuration.
Has anyone experienced this? Or have any suggestions?