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EBSIOBalance% is a measure of the Burst IOPS consumed on the ec2 instance, not the gp3 volumes. You should not let the EBS IOPS exceed the max for the instance type. It looks like your workload requires more than the baseline of 12k so a 4xl might be a better choice. If you need actually 25k then 8xl will work.
$ aws ec2 describe-instance-types --instance-types m5.2xlarge m5.4xlarge m5.8xlarge --query "InstanceTypes[*].[InstanceType, EbsInfo.EbsOptimizedSupport, EbsInfo.EbsOptimizedInfo]"
[
[
"m5.4xlarge",
{
"BaselineIops": 18750,
"MaximumIops": 18750
}
],
[
"m5.2xlarge",
{
"BaselineIops": 12000,
"MaximumIops": 18750
}
]
[
"m5.8xlarge",
{
"BaselineIops": 30000,
"MaximumIops": 30000
}
]
]
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