I just bought myself 2 x 3tb wd red drives and a startech 4 port raid card . Unfortunately, I have a very, very strong suspicion that this is a 'fake-raid' card as it is not from any of the main manufacturers like LSI or 3ware. Transferring files from a WD black 2TB to the raid 1 array is going at an appallingly slow rate of around 60MB/s. Would it not be faster to remove the card, and set up software raid with mdadm?
I just unplugged/unset the hardware raid 1 array, and re-plugged in the drives directly to the motherboard. Transfers direct from drive to drive appear to go at 120MB/s (exactly double). I realise that raid1 has to duplicate the data, but surely It reads at 120mb/s from one drive and each raid drive should write at nearly 120mb/s on each of the reds?