The HPE Smart Array P420 Controller is an enterprise-class 6Gb/s controller that provides improved performance, internal scalability and lower maintenance. P420 controller is ideal for RAID 0/1, 1+0, 5, 50, 6 & 60 and additional advanced features are upgradeable 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 warning.