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Re:EC2 Instance Update – C5 Instances with Local NVMe Storage by chillydawg on Friday May 18, 2018 @03:16AM (#17099307)
The nvme disks are local, not remote EBS. Latency will be the PCI bus.
Re:EC2 Instance Update – C5 Instances with Local NVMe Storage by cthalupa on Friday May 18, 2018 @05:31AM (#17099965)
EBS is exposed as nvme devices on c5 and m5 as well, which is what I assume otterley is talking about.

Presumably the same applies to i3.metal as well, though I have not yet personally checked.

Re:EC2 Instance Update – C5 Instances with Local NVMe Storage by aliguori on Friday May 18, 2018 @12:06PM (#17102532)
Yes, the root volume on i3.metal is exposed as NVMe and is EBS-backed.