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Here's a bit of info I've become aware of recently after merrily going down the road of implementing a 12TB raid5 array. Basically, should a drive in the array fail, statistically its almost certain that another will fail during rebuild. Moral of the story - if making large volumes use raid6 instead, and even then, with today's drive capacities, be careful not to find yourself in the same position.
http://www.zdnet.com/blog/storage/why-raid-5-stops-working-in-2009/162
http://www.zdnet.com/blog/storage/why-raid-5-stops-working-in-2009/162