In general a stripped EBS volume will improve the iowaits. However, in our own tests we see irregular latency spikes during the day from any given EBS backed device, sometimes peaking at 600ms.
We don’t have a good explanation what happening on the EC2, but we will continue to dig.
That’s one of the reasons I’ve said the Riak on Joyent benchmark is really impressive.
Original title and link: MongoDB on Amazon EC2 with EBS Volumes (NoSQL databases © myNoSQL)