You're right, I have two DSS V6 in the same configuration.
Setup as shown in the pdf, networks 192.168.0.x to 192.168.3.x. Left side is .230, right side .240.
SCSI ID is on both sides 0000000000000000 and LUNs are 0.
AUXs are set, checked every setting twice (or more ).
I know the video, I have seen some good webinars with a german presenter (Janusz Bak).
Also you can save your old settings from your old system (DSSv5) and apply them to your Trial DSSv6. (some settings may not work).
To save your configuration and setup settings from the GUI in MAINTENANCE -> miscellaneous -> Function: Save settings. ( same place to restore "reload" them).
Yes, I am using Citrx Xen 5.5 with the V5 and in the new scenario 5.6 with the v6.
But with the old v5 I am not using failover, so export/import settings is obviated.
The pdf "How to setup iSCSI Failover with XenServer" helps me to configure the xen, but unfortunately I don't get to that point. So, how far does the Xen has to be configured, when I am trying to start the failover service? Does he play any role at this point? Configuring the Xen in the mentioned way let the dss service still tell me "Configuration of both nodes finished with errors".