[bdcravens]

Spot instances can now "stop" instead of "terminate" when you get priced out, persisting the attached EBS volumes:

https://aws.amazon.com/about-aws/whats-new/2017/09/amazon-ec...

[fredsted]

This should really be at the top!

[likelynew]

EBS is not the root volume.

[bdcravens]

from the announcement:

"The EBS root device and attached EBS volumes are saved..."

Some instance types don't support an instance root, but require an EBS root.