If your Mac can't connect to any of the DDP volumes after drivers installation and all settings are correct you can attempt the following.
Open terminal and enter the following command:
rm -rf /Library/Extensions/DdpRaid.kext
or
rm -rf /System/Library/Extensions/DdpRaid.kext
This will remove a kernel extension that interferes with the DDP driver and should allow you to connect DDP volumes.