The hpe smart array p420 controller is an enterprise class 6 gbs controller that provides improved performance internal scalability and lower maintenance p420 controller is ideal for raid 01 10 5 50 6 amp 60 and additional advanced features are upgradable by smart array advanced pack p420 delivers increased server uptime by providing advanced storage functionality including online raid level migration with flash backed write cache fbwc global online spare and pre failure warnin