Brother, I urge you to avert your gaze from the Promise controller.
When you're bitten by the stone-throwing RAID0 black demon-infidel, it's best to ask if you really need RAID0. Most people don't.
If you're absolutely convinced you're one of those people, operating system files are something that are less problematic in the event that there's a problem with the array, and an area that can benefit from higher STR (faster program loads are good things).
Boot away.
That said, if you're planning to consort with the heathen non-fault-tolerant arrays, you should at least make sure you have an extra hard disk handy to hold all the user data you consider important, to enforce a rigorous backup schedule. Face east seven times weekly, and worship at the foot of data integrity.
He who prays not to the god of backups, and lays down with stripe sets, will surely face the cleansing scourge of lost files, broken arrays and corrupted data.
So it is written, that many are the disk drives that achieve greatness unto themselves. Forty virgins await the chaste hard disk, called 800JB, or 180GXP, or Raptor.
Assalaam alaykum