This is beautiful:

Is it possible to install on SCSI drives with Adaptec AIC 7899 controller?

I am trying to install Nexenta on a server that is at least 10 years old, it has an Adaptec chip in it, and I figured for sure it would be supported. But no, the driver isn’t open source.

Looks like its possible, but a lot of work:

Adding_Solaris_Drivers_to_a_Nexenta_Installation