Please find the following KB that contain a PDF file that should help you how to setup your DSSv6:
http://kb.open-e.com/How-to-upgrade-to-DSS-V6_712.html
And did you create a 2GB LUN so you can install DSSv6 on it, and keep the other storage size for your data? You may install DSSv6 on a USB flash memory and test it on your system to be sure that your system is working fine.
It only worked when I unpluged all the SATA disks minus 1. Then the installer could identify the USB flash memory and the SATA disk as available for installation.
Thank you for your help.