Re: configuring RAID10 for data in Amazon EC2 cloud?

iostat -x 5 is your friend. We've been struggling with a similar setup recently, and the TL;DR summary is that EBS has unreliable performance and isn't acceptable to use when your performance matters. When it's rocking, a single EBS volume can get you ~1200 IOPs, but far too often, a volume will drop to less than 100 IOPS. And then there are the occasional times when they almost lock up, but not entirely, so they lock up your raid but don't get automatically dropped (though you could drop them yourself).