[MMansfeld]

Even if this doesn't help much in your situation, this is the main reason not to trust in RAID as only safety measure too much - the controller itself is always a single point of failure, and a rather bad one, as normally you can never transfer a raid disk set from one controller to just another controller, it won't be compatible if it's nopt the same brand and model. Situation may be better with software raid if it's open source and available for different OS and hardware platforms.