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I know the answer to your last question which is that the SSD optimized code is all present as the serializing layer so running on SSDs will provide a significant performance boost. I'm not 100% sure what provisioned-IOPS EBS is but I'm guessing from context that it's solid state based?

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No, it's just plain ol' EBS which delivers a minimum of X IOPS, where X is between 100 and 2000 (unless they have improved this since I last checked).

AWS does have some SSD-based storage, but only for the larger instance types.

x <= 4000

Thanks Jeff. I've learned to always provide the caveat "unless AWS have upgraded this recently" due to the speed at which new features are added/improved. :)

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