I'm getting slower than what I would have expected on an external raid box (https://www.scan.co.uk/products/4-bay-icy-box-ib-rd3640su3-external-raid-system-for-35-sata-hdd-with-usb-30-plus-esata-host)
I have connected via Sata on a sata card (https://www.scan.co.uk/products/lycom-pe-130-port-multiplier-aware-2x-sata-iii-6gbps-low-profile-pcie-20-host-adapter) connected to a 1x PCIe slot. I was thinking this was the bottleneck as im capping out at 250MB/s no matter if im using Raid 0, Raid 5 or Raid 10.
I tried connecting over usb 3.0 to make sure that its not the PCIe slot that is the bottle neck but im getting the same speeds.
Is this normal, is there anything i can check?
with 4x 2TB barracua 7200rpm drives I was expecting more like 500-600MBS