kulight,
assuming that you still experience the slow transfer and the problem with the flood of messages in dmesg is solved, can you provide us with a dstat trace as described on https://help.ubuntu.com/community/DiskPerformance ?
kulight,
assuming that you still experience the slow transfer and the problem with the flood of messages in dmesg is solved, can you provide us with a dstat trace as described on https:/ /help.ubuntu. com/community/ DiskPerformance ?