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I read this AWS EBS Volume "in-use - optimizing" and learned that volume performance would be in between the source and target configuration specifications.

My question is, when I change the EBS type (for example from gp2 to io1) and it is in a state of optimizing, is EBS actually synchronizing data to a new EBS, or is EBS just originally the type with the best performance, which limited its type and performance (like CPU) (with no data syncing)?

The same question arises when io1 types change IOPS.

Winter Z.
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When you migrate the EBS volume between EBS type it is synchronising the data between and keeping them in-sync. You will always maintain at least the minimums IOPs for its performance.

Its also of worth noting that there are multiple copies of the volume stored in the AZ, which means its not just synchronizing from 1 volume to another.

Chris Williams
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  • Thank you very much! Do you think it used different EBS types or the same EBS type when making copies for high availability? – Winter Z. May 15 '20 at 04:55