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Hello,
Providing update to my answer :-)
After waiting for a day or two, the physical device stats show up (in the enhanced monitoring tab).
At least in my test, when we EXTEND the existing 200 GB to 400 GB, RDS will change the geometry of the disk from using 1 EBS volume to 4 EBS volumes.
Rob
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Yes this is correct, RDS uses single volume for smaller allocated storage and RAID0 sets of 4 volumes for larger allocated storage. You can read more details about this here: https://aws.amazon.com/premiumsupport/knowledge-center/rds-stuck-modifying/
so this means that till 400 GB RDS uses a single gp3 volume and from 400 GB and above it uses 4 volumes. if so, when we are moving from let's say 350 GB to 400 GB, will the volume update take longer than usual? (as it's moving from single volume to 4 volumes)