So far I used the 8 SATA Ports of my Gigabyte WU-246N motherboard and two USB 3.0 to SATA adapters for Disk3 and Disk6. Today I installed this IOCrest IO-M2F585-5I M.2 SATA adapter to avoid the USB adapters:
http://www.iocrest.com/index.php?id=2070
Everything looks fine after booting:
Nov 19 13:20:05 Thoth root: Starting Nginx server daemon...
Nov 19 13:20:08 Thoth kernel: hid-generic 0003:06DA:FFFF.0004: usb_submit_urb(ctrl) failed: -1
Nov 19 13:20:08 Thoth kernel: hi