do I really need a RAID Controller Cache battery back up? I have RAID 5, two redundant hot swappable power supplies and a UPS with 30 minutes backup. the RAID Controller Cache battery back up is designed to store the RAID Controller's Cache in the event of complete power loss. This server was sent to me by my corp/vendor team. We took down the old one, installed this new one and all knew the RAID Controller Cache battery back up was back ordered and would arrive in the future. Now it is here and the installation requires shutting down the server and pulling all power which will delete the RAID Controller Cache. Does not seem to me like the Cache is all that important as it will probably regenerate on the next power up. What say the experts?