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Are Citus Cloud customers generally IOPS constrained rather than throughput constrained? You're also constrained by the EBS-optimized interconnect, right? http://docs.aws.amazon.com/AWSEC2/latest/UserGuide/EBSOptimi...

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Also, have you considered using i3 instances for their superior price per throughput/IOP? Obviously, you can't rely on EBS snapshot based backup/restore workflows on those instances, but maybe the performance gain is compelling enough to make the exercise worthwhile?

I have rejected this on the basis that stopping and starting an instance is too useful for solving problems. Even with a few striped EBS disks, instance issues solvable by re-attaching the disks via stop/start are probably ten to one hundred times more likely to occur than a disk failure.

Still, I know some people do things this way, relying on archives and HA for redundancy, and it can be pretty good.

As a random sample of operating time, probably latency constrained, where something like a local disk would be nice. We do have occasional spikes for bulk writes and reads, and the good throughput of large IOPS EBS are instrumental there.

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