Since we're on the topic of -hardware- RAID controllers, I thought I'd point users to a one style of reliable, workhorse RAID board, which is available for $peanuts$ surplus (ebay). This board is a 3ware 8006-2LP. They're well supported "out of the box" by all flavors of Linux and are typically very highly reliable, in my experience. The caveats are that they are old PCI-bus boards, not too fast by todays standards, and can only utilize smaller SATA drives....But, they are true hardware RAID 1 and when installed in older PC's, they work very well for Asterisk/AllStar/PBX applications. I've still got many of these installed, here and there. Here is a example board from ebay: http://www.ebay.com/itm/181788655753 These boards have saved me from HD crash frustration more times than I can count! ...They also make it really easy to perform a HD image backup by pulling (they support hot-swap) a running RAID 1 drive and swapping in a spare. The removed drive then becomes a backup. 73, David KB4FXC