Bad disk performance on m3.medium (SSD) EC2 instance

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May be I'm missing something but at a glance new SSD-based m3.medium EC2 instance doesn't provide any disk performance advantage.
I didn't run benchmark tools yet, but directory copying, directory deleting, and hdparm don't show any difference between system and SSD volumes – /dev/sda1 and /dev/sdb.
Am I wrong? Or there is some special configs?


Best Answer

the /dev/sda or /dev/xvda device continues on top of EBS volumes, SSD are only available as Ephemeral Storage.

When create your instance, select /dev/sdb as Instance Store 0 under storage session.