EC2 Instance Update – C5 Instances with Local NVMe Storage

Re:EC2 Instance Update – C5 Instances with Local NVMe Storage by otterley on Friday May 18, 2018 @02:37AM (#17099172)

Interesting - I’ve been using NVMe devices on Linux for a couple years now and never run into this problem. And an I/O timeout of 255 seconds seems really high to begin with. Is there frequently that much latency in the EBS storage backplane? (We also run c5.9xl instances and have not yet experienced the phenomenon you discuss.)

In any event, the instance storage is unlikely to run afoul of any such timeouts since it’s more or less directly attached (albeit virtualized) and there’s no SAN involved.

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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.

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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.

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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.

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