WOW !!! I was not at all aware of this limitation. Thanks for your question.
Could you please point where you read about VC database not supported in SQL clustered environment? I know, few of my clients running VC database in a SQL clustered environment. They do complain that during the time of failover VC stops but a reboot fixes the problem.
Please point me to the link/artice that SSO database not supported in a SQL cluster environment.
Thanks