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storage - Hardware raid controller that supports RAID1 with three active drives?

We have decided that RAID1 would be the best fit for our usage scenario for the following reasons:



1). Our overall storage requirements are relatively modest (< 500GB)
2). RAID1 offers the most simplicity in terms of controller overhead and ease of recovery from a failed drive



The only issue that worries us is simultaneous drive failure. In a standard two drive RAID1 setup this would be terminal.




So the question is, are there any hardware raid controllers that allow the mirroring of 3 drives (preferably with a 4th acting as a hot-spare)? The probability of three drives failing simultaneously is sufficiently tiny not to bother us.



As far as I can tell this might be possible in software raid but doesn't seem to be an option if you want to use a hardware controller?



Any advice (or alternative approaches) welcome!

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