Personally, I would suggest running Solaris on it. Two of my biggest problems with Linux are that it regularly completely revamps large subsystems and its documentation is for shit. Both of these problems have a huge impact on RAID.

While Solaris has overhauled its RAID subsystem from time to time (twice in the last ten years, I think), the user interface has remained largely the same. In addition, its documentation is very complete and, I think, understandable.

It may be important to point out that Solaris is free of cost these days, and has been for many years. It is possible that you might have a hardware incompatibility, though. I haven't kept up to date on Solaris x86's hardware compatibility.