Why do you need to move off Nexenta?
Support for Solaris 11 is 12% of hardware cost per year, so that's a big chunk of change to get support for hardware you already have. Maybe it'd make sense to purchase a smaller number of newer systems directly from Oracle?
The upshot is Oracle only provides support to the machines they want to support, and Supermicro isn't jumping through their hoops. See the HCL definitions for more details.
Thanks for the info. I can not change the OS (Solaris is literarily the only choice), nor can I change the number of servers. I'm running their HCL validation tool to see what happens, otherwise it's 25 new Dell R620's.