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> Resolved CPU throttling with AWS t2.micro instances

What does it mean? I know that all t2.micro instances are CPU throttled (credits system)

Not sure. Perhaps it might be a reference to https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1518457 which caused 100% CPU usage (and thus throttling) on t2 instances in some cases.

Disabling hotadd also fixes I/O errors on nvme disks on the new i3 instances which is mentioned here as well.