Yil, first thank you for your fast answer. I am very grateful of your work and efforts in making ioFTPD the server to use. Further, I would like to show my appreciations and donate a few bucks. If it is possible to do so, could you PM me with details.
The router is a tweaked Asus RT-AC66U so it should be able to deliver more than 200mbit, even through NAT. Anyway, it’s tested using 192.168.xx with same results. Last night I even build and tested with a pfSense firewall, just to take the router out of the equation. Still the same.
With the 40-50mb/s speed you mentioned in mind, it only leave the hard drives to blame. I decided to break down the Raid and test each disk by itself. It seems that two drives is faulty, only delivering very low transfer speeds, very low indeed. SMART says they are all good, and individually the transfer data as expected, but in Raid the performance is ridiculous. I think I’ve might found the answer to the problem
brgds..