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How do I know what is the best configuration for RAID 0 (mdadm create options) between the to ephemeral drives?

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please do some research first and show what you've found before you ask such a short question. for example, google "amazon ec2 ebs raid 0 benchmark". –  longneck Aug 1 '12 at 13:27

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you can use mdadm in a normal way, the same as on any other linux. You should also try increasing the IO on your EBS disks, depending on the application it might be cheaper to have a higher IO disk than a raid.

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