I inherited some DL360 systems which had P440ar Smart Array controller to which the OS drive and 7 data drives were attached. I wanted to experiment with the embedded controller instead so I moved the drives there. (the P440ar was still in the system just nothing connected).
When I measured dd performance using reads with iflag=direct, performance was as I expected, in fact was similar to using the P440ar in HBA mode. However, when I tried dd writes with oflag=direct, performance was terrible (less than 10 MB/s).
Is there some configuration issue I am missing?
