Landy_Ed (11/19/2012)

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Surely the very fact that you get a clearer picture of the impending expiry of the drives makes it less necessary to stage out the drive ageing? I'd be more inclined to recommend simply choosing two different drives or batches to avoid the more dangerous premature hardware failure. Assuming you aim for pro-grade drives rather than the lower end consumer devices that are driver-only, the drive is most likely to come with a toolset that gives fairly detailed information about the current drive health (Intel, for example). I'm pretty sure the fusionio software is also quite detailed, though I've no direct experience of their kit.