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I think the issue here is that you are running out of available IOPS capacity on the ec2 instance class you've selected. Eg, this instance has a max iops of 20k.
$ aws ec2 describe-instance-types --instance-types m6g.4xlarge --query "InstanceTypes[*].[InstanceType, EbsInfo.EbsOptimizedSupport, EbsInfo.EbsOptimizedInfo]"
[
[
"m6g.4xlarge",
{
"BaselineBandwidthInMbps": 4750,
"BaselineThroughputInMBps": 593.75,
"BaselineIops": 20000,
"MaximumBandwidthInMbps": 4750,
"MaximumThroughputInMBps": 593.75,
"MaximumIops": 20000
}
]
]
0
After I changed the disk configuration, iops from 12000 to 13000, I did this modification to triggle the storage optimization action. And the disk io await goes to normal state. Very strange.
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